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
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.
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.
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.
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.
CURT 56000
Ten-foot in-bed outlet harness; requires the approved rear factory harness connection.
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CURT 56001
Dodge-specific version, not automatically compatible with other factory harnesses.
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CURT 56003
Dual-output 4-flat and 7-blade socket, different from single-output extensions.
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CURT 56070
Seven-foot packaged T-harness; adds a second bed-mounted socket.
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CURT 56071
Seven-foot Dodge-specific counterpart; inspect the original OEM connector.
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CURT 56080
Plugs into the exposed rear 7-way socket rather than teeing behind it; check routing and rear-socket availability.
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CURT 57008
Ford-specific seven-foot T-harness with mounting hardware and isolators for relevant aluminum beds.
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CURT 57010
Ten-foot Ford T-harness; includes isolator hardware for relevant aluminum truck beds.
View wiring extension details and availabilityOther CURT trailer plug and wiring references
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