US Patent 9994141 Retractable platform and staircase for a recreational vehicle

A frame mounted on the underside of the RV comprising two parallel tracks. A platform is mounted to the frame for movement about the frame between a retracted position underneath the RV and an extended position extending from the RV. The platform comprises of two parallel rails each of which is mounted to one of the two parallel tracks. A deck extends between the two parallel rails. A prime mover is mounted on one end to the platform and the other end is mounted to the frame to move the platform with respect to the frame.