Pulling a 5th wheel or gooseneck trailer and coming up short on wiring reach? The CURT 56000 extension harness solves the cable-length gap between your truck's bed-mounted 7-pin connector and the trailer's plug -- no splicing, no rigging, no electrical tape fixes. It routes cleanly through or along the truck bed rail and gives you the slack needed for a proper, secure connection every time you hook up.
5th wheel and gooseneck setups route wiring through the truck bed, and factory or aftermarket bed connectors often sit too close to the hitch to comfortably reach the trailer's plug without putting stress on the connector or the harness. The CURT 56000 is purpose-built to extend that reach, providing a clean, weatherproof bridge between the two ends.
Whether you're running a traditional 5th wheel king pin trailer or a gooseneck ball-style hookup, this extension keeps the electrical connection relaxed and strain-free -- which means longer connector life, fewer intermittent brake and light faults, and fewer roadside headaches.
Fits the standard 7-way RV blade connector used on virtually all modern 5th wheel and gooseneck trailers and tow vehicles.
Adds length to relieve tension on the bed-mounted connector, protecting both the truck-side socket and the trailer-side plug from wear and damage.
Plug-and-play design -- no cutting, no crimping, no splicing into existing wiring. Simply connect each end and route along the bed rail.
At just 2.8 lbs and a 9 x 9 x 4 inch footprint, the extension coils neatly in the truck bed when not in use and doesn't add bulk during transit.
Unlike bumper-pull trailers where the 7-pin connector sits right at the hitch, 5th wheel and gooseneck setups mount the truck-side connector toward the front of the bed -- near the cab or along the bed rail. Depending on your truck bed length and hitch position, the trailer plug may be several feet away when the trailer is coupled. Without an extension, the harness stretches tight, which causes connector fatigue, intermittent connections, and eventual socket damage.
The CURT 56000 is compatible with all standard 7-way RV blade-style connectors, which is the industry standard for 5th wheel and gooseneck trailers. This includes trailers wired for electric brakes, running lights, brake lights, turn signals, reverse lights, and a 12V auxiliary power circuit -- all seven pins of the standard RV wiring scheme.
Installation is straightforward for any RV owner comfortable with basic trailer wiring tasks: