AMENDMENT NUMBER TWO
                                       TO
                                CREDIT AGREEMENT


         This AMENDMENT NUMBER TWO TO CREDIT AGREEMENT (this "Amendment"), dated
as of March 24, 1997, is entered into by and among MOBILE MINI, INC., a Delaware
corporation (the "Borrower"),  each financial  institution a party to the Credit
Agreement (collectively, the "Lenders"), and BT COMMERCIAL CORPORATION acting as
agent for the Lenders (the "Agent"), in light of the following facts:

                                 R E C I T A L S

         A. The parties hereto have previously  entered into that certain Credit
Agreement,  dated as of March 28,  1996,  as amended by that  certain  Amendment
Number One to Credit Agreement,  dated as of November __, 1996 (as amended,  the
"Agreement").

         B. The parties hereto desire to amend the Agreement in accordance  with
the terms of this Amendment.

                                A G R E E M E N T

         NOW THEREFORE, the parties hereto agree as follows:

         1. Defined Terms. All initially  capitalized terms used but not defined
herein shall have the meanings assigned to such terms in the Agreement.

         2. Amendments. The Agreement is hereby amended as follows:

                  (a) Section 8.1 of the Agreement is hereby amended by deleting
such Section in its entirety and replacing it with the following:

                           "8.1  Consolidated  Tangible Net Worth.  The Borrower
shall  maintain  a  Consolidated  Tangible  Net Worth as of the last day of each
fiscal quarter of not less than the amount set forth below:


====================================================================================================================
                     Quarter-Ended                                                 Amount
- --------------------------------------------------------------------------------------------------------------------
                                                                                      
                        6/30/96                                                  $10,900,000
- --------------------------------------------------------------------------------------------------------------------
                        9/30/96                                                  $11,500,000
- --------------------------------------------------------------------------------------------------------------------
                        12/31/96                                                 $12,100,000
- --------------------------------------------------------------------------------------------------------------------
                        3/31/97                                                  $12,300,000

                                       1


- --------------------------------------------------------------------------------------------------------------------
                                                                                      
                        6/30/97                                                  $12,900,000
- --------------------------------------------------------------------------------------------------------------------
                        9/30/97                                                  $13,700,000
- --------------------------------------------------------------------------------------------------------------------
                        12/31/97                                                 $14,100,000
- --------------------------------------------------------------------------------------------------------------------
                        3/31/98                                                  $15,000,000
- --------------------------------------------------------------------------------------------------------------------
                        6/30/98                                                  $15,900,000
- --------------------------------------------------------------------------------------------------------------------
                        9/30/98                                                  $17,100,000
- --------------------------------------------------------------------------------------------------------------------
                        12/31/98                                                 $18,100,000
- --------------------------------------------------------------------------------------------------------------------
                        3/31/99                                                  $18,800,000
                     and thereafter
====================================================================================================================


                  (b) Section 8.2 of the Agreement is hereby amended by deleting
such Section in its entirety and replacing it with the following:

                           "8.2 EBITDA.  The Borrower shall maintain  EBITDA for
the immediately  preceding four fiscal quarters calculated as of the last day of
each such quarter of not less than the amount set forth below:


==================================================================================================================
                      Quarter-Ended                                               Amount
- ------------------------------------------------------------------------------------------------------------------
                                                                                    
                         6/30/96                                                $6,100,000
- ------------------------------------------------------------------------------------------------------------------
                         9/30/96                                                $6,900,000
- ------------------------------------------------------------------------------------------------------------------
                        12/31/96                                                $6,400,000
- ------------------------------------------------------------------------------------------------------------------
                         3/31/97                                                $6,900,000
- ------------------------------------------------------------------------------------------------------------------
                         6/30/97                                                $7,200,000
- ------------------------------------------------------------------------------------------------------------------
                         9/30/97                                                $7,500,000
- ------------------------------------------------------------------------------------------------------------------
                        12/31/97                                                $9,000,000
- ------------------------------------------------------------------------------------------------------------------
                         3/31/98                                                $10,200,000
- ------------------------------------------------------------------------------------------------------------------
                         6/30/98                                                $10,800,000
- ------------------------------------------------------------------------------------------------------------------
                         9/30/98                                                $11,300,000
- ------------------------------------------------------------------------------------------------------------------
                        12/31/98                                                $11,900,000
- ------------------------------------------------------------------------------------------------------------------
                 3/31/99 and thereafter                                         $12,500,000
==================================================================================================================

                                       2

                  (c) Section 8.3 of the Agreement is hereby amended by deleting
such Section in its entirety and replacing it with the following:

                           "8.3 Fixed Charge Coverage Ratio.  The Borrower shall
maintain  for the  quarter  ended  June 30,  1996,  for the two  quarters  ended
September  30,  1996,  for the three  quarters  ended  December  31,  1996,  and
thereafter for the immediately  preceding four fiscal quarters a ratio of EBITDA
to  Consolidated  Fixed  Charges of not less than the ratio set forth below,  in
each case calculated as of the end of each such quarter:


====================================================================================================================
                  Four Quarters Ended                                               Ratio
- --------------------------------------------------------------------------------------------------------------------
                                                                               
                        6/30/96                                                   1.15:1.0
- --------------------------------------------------------------------------------------------------------------------
                        9/30/96                                                   1.25:1.0
- --------------------------------------------------------------------------------------------------------------------
                        12/31/96                                                  1.10:1.0
- --------------------------------------------------------------------------------------------------------------------
                        3/31/97                                                    1.0:1.0
- --------------------------------------------------------------------------------------------------------------------
                        6/30/97                                                    1.0:1.0
- --------------------------------------------------------------------------------------------------------------------
                        9/30/97                                                    1.0:1.0
- --------------------------------------------------------------------------------------------------------------------
                        12/31/97                                                  1.20:1.0
- --------------------------------------------------------------------------------------------------------------------
                        3/31/98                                                   1.30:1.0
- --------------------------------------------------------------------------------------------------------------------
                        6/30/98                                                   1.35:1.0
                     and thereafter
====================================================================================================================

                  (d) Section 8.4 of the Agreement is hereby amended by deleting
such Section in its entirety and replacing it with the following:

                           "8.4  Interest  Coverage  Ratio.  The Borrower  shall
maintain  for the  immediately  preceding  four  fiscal  quarters a ratio of (a)
EBITDA to (b) Interest  Expense of not less than the ratio set forth  below,  in
each case calculated as of the end of each such quarter:


====================================================================================================================
                  Four Quarters Ended                                               Ratio
- --------------------------------------------------------------------------------------------------------------------
                                                                               
                        6/30/96                                                   1.65:1.0
- --------------------------------------------------------------------------------------------------------------------
                        9/30/96                                                   1.75:1.0
- --------------------------------------------------------------------------------------------------------------------
                        12/31/96                                                  1.60:1.0
- --------------------------------------------------------------------------------------------------------------------
                        3/31/97                                                   1.60:1.0
- --------------------------------------------------------------------------------------------------------------------
                        6/30/97                                                   1.60:1.0
- --------------------------------------------------------------------------------------------------------------------

                                       3


- --------------------------------------------------------------------------------------------------------------------
                                                                               
                        9/30/97                                                   1.60:1.0
- --------------------------------------------------------------------------------------------------------------------
                        12/31/97                                                  1.90:1.0
- --------------------------------------------------------------------------------------------------------------------
                        3/31/98                                                   2.20:1.0
- --------------------------------------------------------------------------------------------------------------------
                        6/30/98                                                   2.30:1.0
- --------------------------------------------------------------------------------------------------------------------
                        9/30/98                                                   2.40:1.0
- --------------------------------------------------------------------------------------------------------------------
                        12/31/98                                                  2.50:1.0
- --------------------------------------------------------------------------------------------------------------------
                        3/31/99                                                   2.60:1.0
                     and thereafter
====================================================================================================================


                  (e) Section 8.6 of the Agreement is hereby amended by deleting
such Section in its entirety and replacing it with the following:

                           "8.6 Debt Ratio.  The Borrower shall maintain for the
four immediately  preceding  fiscal  quarters,  calculated as of the end of each
such  quarter,  a ratio of Funded  Debt to EBITDA of not more than the ratio set
forth below:


====================================================================================================================
                  Four Quarters Ended                                               Ratio
- --------------------------------------------------------------------------------------------------------------------
                                                                               
                        6/30/96                                                   5.95:1.0
- --------------------------------------------------------------------------------------------------------------------
                        9/30/96                                                   5.50:1.0
- --------------------------------------------------------------------------------------------------------------------
                        12/31/96                                                  6.30:1.0
- --------------------------------------------------------------------------------------------------------------------
                        3/31/97                                                    6.0:1.0
- --------------------------------------------------------------------------------------------------------------------
                        6/30/97                                                    6.0:1.0
- --------------------------------------------------------------------------------------------------------------------
                        9/30/97                                                    6.0:1.0
- --------------------------------------------------------------------------------------------------------------------
                        12/31/97                                                  5.50:1.0
- --------------------------------------------------------------------------------------------------------------------
                        3/31/98                                                   4.35:1.0
- --------------------------------------------------------------------------------------------------------------------
                        6/30/98                                                   4.25:1.0
- --------------------------------------------------------------------------------------------------------------------
                        9/30/98                                                   4.15:1.0
- --------------------------------------------------------------------------------------------------------------------
                        12/31/98                                                  3.95:1.0
- --------------------------------------------------------------------------------------------------------------------
                        3/31/99                                                   3.70:1.0
                     and thereafter
====================================================================================================================

                  (f) Section 8.8 of the Agreement is hereby amended by deleting
such Sections in its entirety and replacing it with the following:
                                       4

                  "8.8  Capital  Expenditures.   The  Borrower  shall  not  make
payments  for Capital  Expenditures  (net of sales of Eligible  Container  Fleet
Inventory) in excess of the following  amounts per fiscal year;  provided,  that
Borrower may carry forward and add to the next year's limitation amount (but not
beyond  such  next  year)  the  unused  portion  of the  limitation  on  Capital
Expenditures  for the prior year, up to a maximum of one-half (1/2) of the prior
year's limitation  amount; and provided,  further,  that the amount set forth in
this Section 8.8 as an annual limit to Capital  Expenditures shall be increased,
for a year in which Borrower effects any sale of equity  securities of Borrower,
by an amount  equal to three  hundred  percent of the net  proceeds  received by
Borrower from any such sale of equity securities of Borrower. The Borrower shall
not make any Capital  Expenditures that are not directly related to the business
conducted on the Closing Date by the Borrower.


===================================================================================================================
         Fiscal Year                    Capital Expenditures             Capital Expenditures For Plant,
         Ended                                                           Property and Equipment Only
                                                                         (i.e., Excluding Container Fleet
                                                                         Inventory Held For Sale)
- -------------------------------------------------------------------------------------------------------------------
                                                                                         
          12/31/96                           $11,700,000                                $3,650,000
- -------------------------------------------------------------------------------------------------------------------
          12/31/97                           $12,800,000                                $4,100,000
- -------------------------------------------------------------------------------------------------------------------
          12/31/98                           $11,600,000                                $2,800,000
- -------------------------------------------------------------------------------------------------------------------
          12/31/99                           $10,900,000                                $2,600,000
       and thereafter
===================================================================================================================

         3. Conditions Precedent. The effectiveness of this Amendment is subject
to and  conditioned  upon  the  fulfillment  of each  and  all of the  following
conditions precedent:

                  (a) BTCC shall have received this  Amendment  duly executed by
Borrower and Majority Lenders; and

                  (b) BTCC  shall  have  received  an  affirmation  letter  duly
executed by each guarantor under the Guaranties,  indicating the consent by each
such guarantor to the execution and delivery by Borrower of this Amendment.

         4.  Counterparts.  This  Amendment  may be  executed  in any  number of
counterparts and by different  parties on separate  counterparts,  each of which
when so  executed  and  delivered  shall be deemed to be an  original.  All such
counterparts, taken together, shall constitute but one and the same Amendment.
                                       5

         5.  Reaffirmation of the Agreement.  Except as specifically  amended by
this Amendment, the Agreement shall remain in full force and effect.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed at Los Angeles, California as of the date first hereinabove written.

                                        MOBILE MINI, INC.,
                                        a Delaware corporation


                                        By: /s/ Larry Trachtenberg
                                           -------------------------------------
                                                 Larry Trachtenberg,
                                                 Chief Financial Officer


                                        BT COMMERCIAL CORPORATION,
                                        a Delaware corporation,
                                        individually and as Agent


                                        By: /s/ 
                                           -------------------------------------

                                        Title:
                                              ----------------------------------


                                        NATIONSBANK OF TEXAS, N.A.


                                        By: /s/ 
                                           -------------------------------------

                                        Title:
                                              ----------------------------------


                                        DEUTSCHE FINANCIAL SERVICES
                                        CORPORATION


                                        By: /s/ 
                                           -------------------------------------

                                        Title:
                                              ----------------------------------
                                       6

                              CONSENT OF GUARANTORS


         Each of the  undersigned,  as a guarantor of the  obligations of MOBILE
MINI,  INC., a Delaware  corporation  ("Borrower"),  arising out of that certain
Credit  Agreement,  dated as of March  28,  1996,  as  amended  by that  certain
Amendment  Number One to Credit  Agreement,  dated as of  November  __, 1996 (as
amended,  the  "Agreement"),   among  BT  Commercial  Corporation,   a  Delaware
corporation  ("Agent")  and the lenders party  thereto  ("Lenders"),  on the one
hand, and Borrower,  on the other, hereby acknowledges receipt of a copy of that
certain  Amendment Number Two to Credit  Agreement,  dated as of March 24, 1997,
among Agent, Lenders and Borrower,  consents to the terms contained therein, and
agrees that the Continuing  Guaranty  executed by each of the undersigned  shall
remain in full force and effect as a continuing  guaranty of the  obligations of
Borrower owing to Agent and Lenders under the Agreement.

         Although  Agent has informed us of the matters set forth above,  and we
have acknowledged same, we understand and agree that Agent has no duty under the
Agreement,  the Guaranty or any other agreement between us to so notify us or to
seek an  acknowledgment,  and nothing  contained  herein is intended to or shall
create such a duty as to any advances or transactions hereafter.

         IN WITNESS WHEREOF,  each of the undersigned has caused this Consent of
Guarantors to be duly  executed by their  respective  authorized  officers as of
March 24, 1997.

                                        MOBILE MINI I, INC.,
                                        an Arizona corporation


                                        By  /s/ 
                                           -------------------------------------

                                        Title
                                             -----------------------------------


                                        DELIVERY DESIGN SYSTEMS, INC.,
                                        an Arizona corporation


                                        By  /s/ 
                                           -------------------------------------

                                        Title
                                             -----------------------------------
                                       7