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EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER OF THE REGISTRANT,
PURSUANT TO 17 CFR 240.13a  14(a) OR 17 CFR 240.15d  14(a)

I, Ray E. Schmitz, certify that:



| | 1. |  | I have reviewed this quarterly report on Form 10-Q of Dynamex Inc.;
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| | 2. |  | Based on my knowledge, this report does not contain any untrue
statements of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to
the period covered by this report;
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| | 3. |  | Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in all
material respects the financial condition, results of operations and
cash flows of Dynamex Inc. as of, and for, the periods presented in
this report.
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| | 4. |  | The registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and
we have:
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| | a. |  | Designed such controls and procedures, or caused such
disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made
known to us by others within those entities, particularly during
the period in which this report is being prepared;
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| | b. |  | Evaluated the effectiveness of the registrants
disclosure controls and procedures and presented in this report
our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by
this report based on such evaluation, and
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| | c. |  | Disclosed in this report any change in the
registrants internal control over financial reporting that
occurred during the registrants most recent fiscal quarter that
has materially affected, or is reasonably likely to materially
affect, the registrants internal control over financial
reporting;
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| | 5. |  | The registrants other certifying officer and I have disclosed,
based on our most recent evaluation of internal control over financial
reporting, to the registrants auditors and the audit committee of
registrants board of directors;
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| | a. |  | All significant deficiencies and material weaknesses
in the design or operation of internal controls which could
adversely affect the registrants ability to record, process,
summarize and report financial information; and
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| | b. |  | Any fraud, whether or not material, that involves
management or other employees who have a significant role in the
registrants internal controls over financial reporting.
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Date: December 9, 2003

/s/ RAY E. SCHMITZ

Name: Ray E. Schmitz
Title: Vice President and Chief Financial Officer