Fifth Wheel Definition:
The fifth wheel is a towable hitch attachment added to a tractor, truck or trailer bed, and other specified vehicles.
The Fifth Wheel gets its name from the company that developed the Martin's Fifth Wheel Company. It has a U-shaped hitch and a kingpin that securely connects the cargo and evenly distributes the weight to the trailer, tractor, or towing vehicle. Fifth wheels are common in recreational vehicles and are designed for quick, easy, and stable hauling. A fifth-wheel RV has lower chances of swaying than travel trailers since the overall design is more aerodynamic and easier to maneuver.