Fifth Wheel
Fifth-wheel trailer, kingpin trailer, gooseneck trailer, 5th wheel RV
A fifth wheel is a large towable recreational vehicle that connects to a specially designed hitch mounted in the bed of a pickup truck via a kingpin coupling, rather than a standard ball hitch.
Fifth wheels offer more living space than standard caravans and are more stable when towing due to the over-axle connection point. They require a pickup truck with a fifth-wheel hitch installed in the truck bed.