2007 Dodge Ram Pickup Trailer Wiring | etrailer Lowest Price Trailer Wiring Guarantee. Installation instructions and lifetime expert support on all purchases of 2007 Dodge Ram Pickup Trailer Wiring. Order online at etrailer 2007 Dodge Ram Hitch Wiring - CARiD Dodge Ram 1500 / 2500 / 3500 2007, Towing Wiring Harness by Tekonsha®. One-year warranty. Wire up your tow vehicle and trailer with whatever it takes to get your trailer lights on, the electric brakes slowing down, and the trailer..