KOVAL 4000 lb Trailer Hitch Receiver Extender Adapter Class III/IV The Dual Hitch receiver allows for the hitch to be used for dual purposes The bottom hitch can be used for towing a trailer, boat or camper while the upper tube can be used to carry a bike rack, cargo carrier or other hitch accessories The receiver hitch extension is an all steel construction and has a black powder coat finish Requires a Class III or IV trailer hitch