CURT In-Bed 7-Way Trailer Wiring: Length & Connector Guide

A fifth-wheel or gooseneck trailer is easier to connect when the truck has a 7-way RV blade socket in the bed. CURT offers vehicle-specific T-harnesses that keep the bumper socket connected, plus a universal 7-foot extension that routes from the existing rear 7-way socket. Choose the correct connector method, output type and cable length for the truck.

Three distinct in-bed wiring arrangements

Factory T-harness

56000, 56070 and the vehicle-specific 56001/56071, 57008/57010 products tee into approved factory wiring behind the original socket, keeping the rear bumper outlet connected.

Dual-output socket

56003 supplies both a 7-way RV blade and 4-flat connector at the bed location for selected Chevrolet/GMC trucks. It is not a standard single-output harness.

Rear-socket route

56080 uses an existing rear 7-way RV blade socket to route its seven-foot connection into the truck bed. Unlike the T-harness versions, it occupies the existing outlet connection.

CURT truck-bed 7-way wiring comparison

All entries add or route a trailer electrical outlet to the truck bed, but their vehicle-side connector arrangements vary. Select the exact MPN using the latest CURT vehicle fit chart, not just the listed length.

MPN Length Connects at Bed output Application reference
56000 10 ft Factory harness T-connector 7-way RV blade Selected older factory-wired truck platforms
56001 10 ft Dodge/Ram-specific factory T-connector 7-way RV blade Selected Dodge Ram / Dakota trucks
56003 7 ft Factory harness T-connector 7-way RV blade + 4-way flat Selected Chevrolet/GMC pickups
56070 7 ft Factory harness T-connector 7-way RV blade Selected factory-wired truck platforms
56071 7 ft Dodge/Ram-specific factory T-connector 7-way RV blade Selected Dodge Ram / Dakota trucks
56080 7 ft Rear-socket extension 7-way RV blade Existing rear bumper 7-way RV blade socket
57008 7 ft Ford factory harness T-connector 7-way RV blade Selected newer Ford F-150 / Super Duty
57010 10 ft Ford factory harness T-connector 7-way RV blade Selected newer Ford F-150 / Super Duty

Vehicle descriptions identify general product families, not universal fitment for all model years. CURT identifies 57008 and 57010 for selected newer Ford pickups with OEM 7-way wiring.

Truck-bed installation and wiring checks

Confirm clearance behind the bed wall before drilling. CURT lists a 2⅛-inch hole saw for the 56070 and newer Ford T-harness installations. Secure the routed loom to prevent rubbing, heat exposure or pinching, and verify each circuit after connecting.

Do not choose solely by wire length

57008 and 57010 include isolator hardware for relevant aluminum Ford truck beds. 56003 has a separate 4-flat output. 56080 connects to the rear 7-way socket instead of teeing behind it. These differences matter even if the bed-side socket looks similar.

Disconnect the vehicle battery when instructed by CURT, support all cable runs and test trailer lighting, brake-control and auxiliary circuits according to the truck and trailer instructions.

CURT truck-bed wiring extension products

Choose the required connector type and length below to review product details and availability.

Other CURT trailer plug and wiring references

Trailer-side 7-way replacement harnesses

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