7' CUSTOM EXTENSION HARNESS 15-25 F150/17-26 S/DUTY7' CUSTOM WIRING EXTENSION HARNESS (ADDS 7 WAY RV BLADE TO TRUCK BED); 15 25 F150 17 26 SUPER DUTY (EXC CAB & CHASSIS) 7' Custom Wiring Extension Harness (Adds 7 Way RV Blade to Truck Bed, Packaged) Routes a 7 way RV blade socket into truck bed while retaining use of rear socket Simple plug and play design eliminates the need for cutting or splicing Allows for easy connection of 5th wheel or gooseneck wiring 7 way connects tail, brake, reverse, turn