5th wheels and goosenecks must be equipped with the proper lighting and electrical systems, and require more complex connectors than a standard receiver-type trailer setup. Make things simple with a CURT 5th wheel / gooseneck extension harness. These wiring harnesses are designed to put an extra connector socket in the bed of your pickup truck while still retaining power to the rear connector socket mounted on your bumper. This is done by plugging into the back of the existing original equipment (OEM) harness and routing through the body of the truck to a hole in the truck bed, providing a connector that is ready to accommodate your 5th wheel or gooseneck trailer. This CURT extension harness is designed to work with 7-way RV blade connectors and is compatible with certain models of Chevrolet, Dodge, Ford, GMC and Nissan (to verify your vehicle compatibility, see the CURT application guide). Spring-loaded dust cover keeps connector clean when not in use. Slit loom keeps wires contained and well protected Allows for easy connection of 5th wheel or gooseneck wiring 7-way connects tail, brake, reverse, turn signals, brakes & auxiliary power 10' extension with right-angle plug for easy installation | Curt 10' Custom Wiring Harness Extension