Abstract: An extensible, exterior room for a recreational vehicle trailer comprising a floor, a roof, and at least one flexible wall is provided. The floor and the roof are each extensible between a stowed position and an open position. The floor is supported at one end by a frame on the underside of the trailer chassis, and at the other end by stabilizer legs with optional wheel mounts that are rotatable between a working and a non-working position. The roof is hinged to the trailer and is supported in the open position by hydraulic struts. The flexible walls are detachable from the roof and floor and may be stowed separately. The exterior room is accessible from the interior of the trailer through an exit, such as a sliding door style patio door.

Abstract: A fifth wheel trailer for hitching to a truck by a fifth wheel hitch in a towing bed of the truck wherein a front section of the trailer extends over a cab of the truck when the trailer is coupled to and supported by the fifth wheel hitch. The front section of the trailer comprises a first section extending over the towing bed of the truck and a second section extending over the cab of the truck.