Vehicle transport structures

A structure for supporting vehicles one above the other during transport or storage, the structure comprising a base frame having corner posts that in use support an upper frame on which an upper vehicle can be supported in an elevated transport position above a lower vehicle, the upper frame being guided up the corner posts when the upper vehicle is raised to the elevated transport position and support means associated with the corner posts for fastening the upper frame in the elevated transport position relative to the corner posts, wherein the structure is transportable in a collapsed state when not in use with the corner posts being secured to longitudinally extending side members of the base frame and folding down transversely by rotating the side members and corner posts inwardly relative to a cross member of the base frame so that the corner posts and side members lie substantially in a horizontal plane containing the side members when the structure is collapsed in order to occupy less space when not in use with the frames in a nested configuration.