<PAGE>

                                                                  EXHIBIT 10.126

                                Schedule No. 4
                    Schedule of Indebtedness and Collateral

To Master Security Agreement, dated 4-5-00 between the undersigned Secured Party
and Debtor.

This Schedule of Indebtedness and Collateral incorporates the terms and
conditions of the above-referenced Master Security Agreement.

This is Originally Executed Copy No. 1 of 1 originally executed copies. Only
transfer of possession by Secured Party of Originally Executed Copy No. 1 shall
be effective for purposes of perfecting an interest in this Schedule by
possession.

The equipment listed on this Schedule will be located at:

   4411 S. 40th Street            Phoenix           AZ                 85040
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   Address                        City              State              Zip Code

Debtor grants to Secured Party a security interest in the property described
below, along with all present and future attachments and accessories thereto and
replacements and proceeds thereof, including amounts payable under any insurance
policy, all hereinafter referred to collectively as "Collateral".

Collateral Description (Describe Collateral fully including make, kind of unit,
model and serial numbers and any other pertinent information.)

One (1) 1999 Peterbilt Model 330 Medium Duty Chassis VIN # 38PNHD7X2XF482183
With a Heavy Duty Service Body S/N  N/A
Including all present and future attachments and accessories thereto and
replacements and proceeds thereof, including amounts payable under any insurance
policy.
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Debtor promises to pay Secured Party (i) the total principal sum of $81,059.10
in 60 (total number) principal payments of $1,351 each, commencing on 8/14/00,
and a like sum on a like date of each month thereafter until fully paid,
provided, however, that the final payment shall be in the amount of the unpaid
balance, plus (ii) interest payable monthly at 0.00% in excess of the "governing
rate" on unpaid principal balances, but in no event greater than the highest
rate permitted by relevant law in effect from time to time during the term of
this Security Agreement even if this Security Agreement shall state a minimum
rate of interest.

"Governing rate" shall mean a rate equal to the highest of (i) the Prime Rate of
The Chase Manhattan Bank or its successors or (ii) "The Wall Street Journal
Prime Rate" or (iii) the commercial paper rate in effect from time to time.
Interest shall be computed on the basis of a year of 360 days. The Prime Rate of
The Chase Manhattan Bank or its successors shall mean the rate of interest
publicly announced by The Chase Manhattan Bank or its successors in New York
from time to time as its Prime Rate. The Prime Rate of The Chase Manhattan Bank
or its successors is not intended to be the lowest rate of interest charged by
The Chase Manhattan Bank or its successors to its borrowers. "The Wall Street
Journal Prime Rate" shall mean the Prime Rate listed by the Wall Street Journal,
If more than one Prime Rate is listed in the Wall Street Journal, then the
highest rate shall apply. "Commercial paper rate" shall mean the average rate
quoted by the Wall Street Journal or such other source as Secured Party may
determine for 30-day dealer commercial paper.

The Debtor shall take all action necessary to assure that its computer-based
systems are able to effectively process data including dates and date sensitive
functions. The Debtor represents and warrants that the Year 2000 problem (that
is, the inability of certain computer applications to recognize and correctly
perform properly date-sensitive functions involving certain dates prior to and
after December 31, 1999) will not result in a material adverse effect on the
Debtor's business condition or ability to perform hereunder. Upon request, the
Debtor shall provide assurance acceptable to the Secured Party that the Debtor's
computer systems and software are or will be Year 2000 compliant on a timely
basis. The Debtor shall immediately advise Secured Party in writing of any
material changes in the Debtor's Year 2000 plan, timetable or budget.

See Special Provisions Instructions below.




Accepted   7-12-2000
         -----------------------

Secured Party:


THE CIT GROUP/EQUIPMENT FINANCING, INC.


By /s/ Heather Meheut             Title  AGENT
  ------------------------------        -------------------------

Executed on   6-28-00
           ---------------------

Debtor:


Meadow Valley Contractors, Inc.
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Name of individual, corporation or partnership

By /s/ Kenneth D. Nelson         Title  Vice President
  ------------------------------        --------------------------
<PAGE>

                                                                  7-13-00
                                                               ---------------
                                                               Date

THE CIT GROUP/EQUIPMENT FINANCING, INC.

P. O. BOX 27248
-----------------------------------------

Tempe                  AZ      85285-7248
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City                   State   Zip Code

Gentlemen:

You are irrevocably instructed to disburse the proceeds of Schedule of
Indebtedness and Collateral No. 4 dated June 28, 2000 between Meadow Valley
Contractors, Inc. as Debtor and The CIT Group/Equipment Financing, Inc. as
Secured Party as follows:

Payee Names and Addresses                                            Amount

--------------------------------------------------------------------------------
Associates Leasing, Inc. (Acct # 00-007690)                        $ 56,818.27
                                                                   -----------

Information Leasing Corp.                                          $ 19,507.77
                                                                   -----------

Jerry's Custom Service                                             $  4,733.06
                                                                   -----------


Very Truly Yours,

Jerry Slusher dba Jerry's Custom Service


By: /s/ Jerry Slusher                            Title: Individual
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