The present invention relates to a support structure for a vehicle provided with a cargo crane having a crane base, said support structure comprising a support beam connectable to said crane base and a support leg, wherein a proximal end of said support leg is connected to said support beam at a pivoting point, such that, said support leg is pivotable around said pivoting point relative to said support beam. The support structure further comprises an actuating device connected to the support leg for pivoting said support leg relative to said support beam, wherein said actuating device is configured to arrange said support structure in at least a tunnel mode and a diagonal mode, by adjusting an extension of said actuating device, such that in the tunnel mode, a distal end of said support leg is positioned to abut against a supporting surface on which the vehicle stands and in the diagonal mode, a knee of the support structure or at least a part of a lateral side of said support leg is positioned to abut against the supporting surface on which the vehicle stands.