Patent ID: 7976064

Claim:
A device for facilitating movement of a vehicle across the ground, including a surface for contacting the ground, the surface being mounted on a body, and a connector for attaching the body to an underside of the vehicle, wherein: a. the surface is movable independently of movement of the vehicle in at least a reverse direction relative to the vehicle's direction of movement, b. friction-reducing components are provided between the surface and the body, c. the friction-reducing components being arranged to be able to: (1) roll around an exterior of the body, between the body and the surface, and (2) roll with respect to the surface, such that the surface travels with respect to the friction-reducing components, d. the body has at least one guide channel, e. the surface has hooks for co-operating with the guide channel, each hook including a pair of rollers, at least one of the pair of rollers having a rotational axis extending from the ground-contacting surface in an at least substantially perpendicular direction.