March 28, 2003 Smithway Motor Xpress, Inc. 2031 Quail Avenue Fort Dodge, Iowa 50501 And East West Motor Express, Inc. 1170 JB drive Black Hawk, South Dakota 57718 Re: Fourth Amendment to Amended and Restated Loan and Security Agreement Gentlemen: Smithway Motor Xpress, Inc., an Iowa corporation ("Smithway Inc.") and East West Motor Express, Inc., a South Dakota corporation ("East West") (Smithway Inc. and East West each a "Borrower" and collectively the "Borrowers") and LaSalle Bank National Association, a national banking association ("Bank") have entered into that certain Amended and Restated Loan and Security Agreement dated December 28, 2001 (the "Security Agreement"). From time to time thereafter, Borrowers and Bank may have executed various amendments (each an "Amendment" and collectively the "Amendments") to the Security Agreement (the Security Agreement and the Amendments hereinafter are referred to, collectively, as the "Agreement"). Borrowers and Bank now desire to further amend the Agreement as provided herein, subject to the terms and conditions hereinafter set forth. NOW, THEREFORE, in consideration of the foregoing recitals, the mutual covenants and agreements set forth herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: 1. The Agreement hereby is amended as follows: Smithway Motor Xpress, Inc. March 28, 2003 Page 2 (a) Section (10) of the Agreement is deleted in its entirety and the following is substituted in its place: (10) TERMINATION; AUTOMATIC RENEWAL. THIS AGREEMENT SHALL BE IN EFFECT UNTIL UPON EXECUTION OF THIS AMENDMENT UNTIL DECEMBER 31, 2003 (THE "ORIGINAL TERM") AND SHALL AUTOMATICALLY RENEW ITSELF FROM MONTH TO MONTH THEREAFTER (EACH SUCH ONE-MONTH RENEWAL BEING REFERRED TO HEREIN AS A "RENEWAL TERM") unless (A) THE DUE DATE OF THE LIABILITIES IS ACCELERATED PURSUANT TO SECTION 16 HEREOF; OR (B) A BORROWER OR LENDER ELECTS TO TERMINATE THIS AGREEMENT AT THE END OF THE ORIGINAL TERM OR AT THE END OF ANY RENEWAL TERM BY GIVING THE OTHER PARTY WRITTEN NOTICE OF SUCH ELECTION AT LEAST FIFTEEN (15) DAYS PRIOR TO THE END OF THE ORIGINAL TERM OR THE THEN CURRENT RENEWAL TERM IN WHICH CASE BORROWERS SHALL PAY ALL OF THE LIABILITIES IN FULL ON THE LAST DAY OF SUCH TERM. If one or more of the events specified in clauses (a) and (b) occurs, then (i) Lender shall not make any additional Loans on or after the date identified as the date on which the Liabilities are to be repaid; and (ii) this Agreement shall terminate on the date thereafter that the Liabilities are paid in full. At such time as Borrowers have repaid all of the Liabilities and this Agreement has terminated, Borrowers shall deliver to Lender a release, in form and substance satisfactory to Lender, of all obligations and liabilities of Lender and its officers, directors, employees, agents, parents, subsidiaries and affiliates to such Borrowers, and if Borrowers are obtaining new financing from another lender, Borrowers shall deliver such lender's indemnification of Lender, in form and substance satisfactory to Lender, for checks which Lender has credited to such Borrower's account, but which subsequently are dishonored for any reason or for automatic clearinghouse or wire transfers not yet posted to such Borrower's account. Smithway Motor Xpress, Inc. March 28, 2003 Page 3 (b) Subsection 14 (a) of the Agreement is deleted in its entirety and the following is substituted in its place: (a) Tangible Net Worth The Consolidated Group's Tangible Net Worth shall not at any time be less than the Minimum Tangible Net Worth; "Minimum Tangible Net Worth" being defined for purposes of this subsection as (i) $13,000,000.00 at all times from January 1, 2003 through December 31, 2003; and (ii) thereafter, from the last day of each Fiscal Year of the Consolidated Group through the day prior to the last day of each immediately succeeding Fiscal Year of the Consolidated Group, the Minimum Tangible Net Worth during the immediately preceding period plus $1,000,000.00; and "Tangible Net Worth" being defined for purposes of this subsection as the Consolidated Group's shareholders' equity (including retained earnings) less the book value of all intangible assets as determined solely by Lender on a consistent basis plus the amount of any LIFO reserve plus the amount of any debt subordinated to Lender, all as determined under generally accepted accounting principles applied on a basis consistent with the financial statement dated December 31, 2002 except as set forth herein; 2. This Amendment shall not become effective until fully executed by all parties hereto. 3. Except as expressly amended hereby and by any other supplemental documents or instruments executed by either party hereto in order to effectuate the transactions contemplated hereby, the Agreement and Exhibit A thereto hereby are ratified and confirmed by the parties hereto and remain in full force and effect in accordance with the terms thereof. Smithway Motor Xpress, Inc. March 28, 2003 Page 4 LASALLE BANK NATIONAL ASSOCIATION By /s/ John Mostofi ----------------------------- Title Sr VP -------------------------- ACKNOWLEDGED AND AGREED TO this 28th day of March, 2003: SMITHWAY MOTOR XPRESS, INC. By /s/ William G. Smith ----------------------------- William G. Smith Title President EAST WEST MOTOR EXPRESS, INC. By /s/ William G. Smith ----------------------------- William G. Smith Title President Consented and agreed to by the following guarantor(s) of the obligations of Smithway Motor Xpress, Inc. and East West Motor Express, Inc. to LaSalle Bank National Association. SMSD Acquisition Corp. By: /s/ G. Larry Owens ----------------------------- G. Larry Owens Title: Vice President Date: March 28, 2003 Smithway Motor Xpress, Inc. March 28, 2003 Page 5 Smithway Motor Xpress Corp. By: /s/ G. Larry Owens ----------------------------- G. Larry Owens Title: Vice President Date: March 28, 2003