Abstract: A vehicle clamp assembly has an upper end releasably clampable to a vehicle frame member, and a lower end releasably attachable to a support frame. The assembly is rotatable about a first axis substantially parallel to the support frame and is also rotatable about a second axis substantially perpendicular to both the support frame and the first axis. The assembly's base can thus be levelled with respect to the support frame before the assembly is attached to the support frame. This allows the assembly to be clamped onto a vehicle frame member, irrespective of the frame member's orientation relative to the support frame.