A support for use in conjunction with a camper (carriable by a conveying vehicle) and a plurality of conventional lifting jacks is constructed from square cross section ferrous tubing. The support is collapsible from an assembled state in which it supportively abuts the bottom of the camper when the camper is not carried by the vehicle. The support eases at least a significant portion of the load of the camper from the jacks, so as to avoid buckling of the camper sides by the jacks. Preferably, the jacks are maintained in position to stabilize the camper against transverse movement caused by wind or by movement inside the camper. The support is constructed from a pair of opposing end elements, each having a pair of vertical members connected by a horizontal cross member, and an upwardly opening socket on the upper ends of the vertical members. The support also includes a pair of connecting elements each having a pair of vertical legs, dimensioned to be slidably received in the sockets, which are connected by a horizontal side member.