<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2020-02-11</periodOfReport>

    <dateOfOriginalSubmission>2020-02-11</dateOfOriginalSubmission>

    <issuer>
        <issuerCik>0001342287</issuerCik>
        <issuerName>General Finance CORP</issuerName>
        <issuerTradingSymbol>GFN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001544342</rptOwnerCik>
            <rptOwnerName>Baker Gregory B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>LEVEL 3</rptOwnerStreet1>
            <rptOwnerStreet2>1 MERRIWA STREET</rptOwnerStreet2>
            <rptOwnerCity>GORDON NSW</rptOwnerCity>
            <rptOwnerState>C3</rptOwnerState>
            <rptOwnerZipCode>2072</rptOwnerZipCode>
            <rptOwnerStateDescription>AUSTRALIA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CFO-GFN Asia Pacific Holdings</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Unit</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-02-11</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4751</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4751</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4751</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This Form 4 is being amended to correct an error in the February 11, 2020 filing relating to the February 11, 2020 equity grant. The February 11, 2020 grant should have been reflected as a grant of a restricted share unit, and this filing makes that correction.</footnote>
        <footnote id="F2">(1) For 50% of the award, 33.3% will vest on each of the first three anniversaries of the date of grant if still employed; and (2) For 50% of the award, 33.3% will vest based upon meeting Royal Wolf EBITDA targets established by the General Finance Corporation board of directors for fiscal years 2020, 2021 and 2022 if still employed.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Christopher A Wilson, attorney-in-fact for Gregory B Baker</signatureName>
        <signatureDate>2020-09-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
