EXHIBIT 99.4


              JOINDER TO ADVISED REVOLVING LINE OF CREDIT AGREEMENT
                                       AND
                          JOINDER TO SECURITY AGREEMENT


           The  undersigned,  a  subsidiary  of Transit  Group,  Inc., a Florida
corporation,  hereby  joins in that  certain  Advised  Revolving  Line of Credit
Agreement  dated as of December 18, 1997 (the "Loan  Agreement")  by and between
AmSouth Bank, a bank organized  under the laws of Alabama  ("Lender"),  Borrower
and the  Guarantor  (each as  defined in the Loan  Agreement),  and agrees to be
bound by all of the terms of the Loan  Agreement,  together with any amendments,
modifications  and  restatements  thereof,  which  terms are  applicable  to the
undersigned.

           The  undersigned  further  joins in that certain  Security  Agreement
dated as of December 18, 1997 (the "Security  Agreement") by and between Lender,
Borrower and the Guarantor (each as defined in the Loan  Agreement),  and agrees
to be bound by all of the terms of the  Security  Agreement,  together  with any
amendments,  modifications and restatements thereof,  which terms are applicable
to the undersigned.

           The  undersigned  further  warrants  that  it is a  corporation  duly
organized  and  existing  under  the laws of the  State of  Indiana  and is duly
qualified  to do  business  in the  States  of  Indiana,  Kentucky  and in  each
jurisdiction  where the failure to be so qualified would have a material adverse
effect on Borrower. To the best of the undersigned's knowledge and belief, it is
in material  compliance with all applicable  laws and regulations  governing the
conduct of its business and governing  consummation of the  transactions and its
principal place of business is located in the State of Kentucky.

           Dated as of the 14th day of January, 1998.


Signed, sealed and delivered             RAINBOW TRUCKING SERVICES, INC.,
in the presence of:                      an Indiana corporation


                                         By: /s/ Philip A. Belyew
                                         Philip A. Belyew,
                                         Chairman of the Board