MOCW 7 ft 7-Pin Trailer Wiring Harness Extension for Truck Bed — 7-Way RV Blade, Plug-and-Play

If you tow 5th wheel or gooseneck trailers from a pickup, this MOCW 7-foot wiring harness extension gives you a dedicated, factory-friendly way to relocate a 7-pin RV-style socket into the truck bed. Designed for common truck makes including Chevrolet, Dodge, Ford, GMC, Nissan, Ram and Toyota, the harness preserves your original rear connector and plugs in without cutting or splicing. It provides standard trailer lighting circuits and an auxiliary power feed, with a right-angle plug, dust cover and plug-and-play installation for easier hookup and cleaner routing.

How does the harness keep my truck's rear socket usable?

The extension taps into your existing tow wiring and extends the 7-way blade socket forward into the bed so you don’t lose the factory rear outlet. It’s designed to plug into the truck’s wiring harness, allowing both the original rear connector and the new bed socket to operate independently.

• Plugs into factory wiring—no cutting required
• Maintains original rear socket functionality
• Right-angle plug reduces strain and improves fit

What trailer functions does this 7-pin extension support?

This 7-pin connector carries the standard trailer circuits required by most 5th wheel and gooseneck setups: taillights, brake lights, turn signals, reverse lights and an auxiliary power line for accessories or brake controllers. It provides the common RV blade wiring configuration and includes features to protect the connection when not in use.

• Taillights, brake lights and turn signals
• Reverse light circuit for backup lighting
• Auxiliary power feed for brake controllers or accessories
• Spring-loaded dust cover to keep contacts clean

How difficult is installation and what tools do I need?

Installation is intended to be user-friendly: the 7-foot length gives flexible routing inside the bed and the harness uses a plug-and-play approach to avoid cutting or splicing. You will typically need a 2-1/8-inch hole saw for mounting the socket to the bed surface, plus basic hand tools to secure the harness and fasteners.

• 7 ft length allows versatile placement and routing
• Right-angle plug simplifies under-bed clearance
• Requires a 2-1/8" hole saw and common hand tools

Will this fit my truck make and trailer type?

The harness is built to match popular truck wiring systems and is compatible with many Chevrolet, Dodge, Ford, GMC, Nissan, Ram and Toyota models when used for 5th wheel and gooseneck towing. Verify your vehicle’s tow-wiring connector type and plug orientation before purchase to ensure a correct fit.

• Designed for common U.S. truck makes listed above
• Intended for 5th wheel and gooseneck trailer wiring needs
• Check your truck’s factory connector style for compatibility

Who is this for? If you regularly tow 5th wheel or gooseneck trailers and want a clean, reversible way to move a 7-way socket into the truck bed without disabling the factory rear outlet, this MOCW 7-foot 7-pin extension is built for you. It’s suitable for pickup owners who prefer a plug-and-play installation, need standard trailer lighting and auxiliary power, and want a durable connector with a dust cover for outdoor use.