<PAGE>

                                                                    EXHIBIT 31.2




     CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Gloria A. Koster, certify that:

1.  I have reviewed this quarterly report on Form 10-Q of Uniprop Manufactured
    Housing Income Fund;

2.  Based on my knowledge, this quarterly report does not contain any untrue
    statement 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
    the quarterly report;

3.  Based on my knowledge, the financial statements, and other financial
    information included in this quarterly report, fairly present in all
    material respects the financial condition, results of operations and cash
    flows of the registrant as of, and for, the periods presented in this
    quarterly report;

4.  The registrant's other certifying officers 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:

        a.  designed such disclosure controls and procedures 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
            quarterly report is being prepared;
        b.  evaluated the effectiveness of the registrant's disclosure controls
            and procedures as of a date within 90 days prior to the filing date
            of this quarterly report (the "Evaluation Date"); and
        c.  presented in this quarterly report our conclusions about the
            effectiveness of the of the disclosure controls and procedures based
            on our evaluation as the Evaluation Date.

5.  The registrant's other certifying officers and I have disclosed, based on
    our most recent evaluation, to the registrant's auditors and the audit
    committee of registrant's board of directors (or persons performing the
    equivalent function):

        a.  all significant deficiencies in the design or operation of internal
            controls which could adversely affect the registrant's ability to
            record, process, summarize and report financial data and have
            identified for the registrant's auditors any material weaknesses in
            internal controls; and
        b.  any fraud, whether or not material, that involves management or
            other employees who have a significant role in the registrant's
            internal controls; and

6.  The Registrant's other certifying officers and I have indicated in this
    quarterly report whether or not there were significant changes in internal
    controls or in other factors that could significantly affect internal
    controls subsequent to the date of our most recent evaluation, including any
    corrective actions with regard to significant deficiencies and material
    weaknesses.

Date: November 12, 2003                      Signature: /s/ Gloria A. Koster
                                                        ---------------------
                                       Gloria A. Koster, Chief Financial Officer