2007 Ford Expedition Trailer Wiring | etrailer Lowest Price Trailer Wiring Guarantee. Installation instructions and lifetime expert support on all purchases of 2007 Ford Expedition Trailer Wiring. Order online at etrailer or call 800-298-8924. 2007 Ford Expedition Hitch Wiring | Harnesses, Adapters Ford Expedition 2007, Custom Wiring Connector by CURT®. Output Type: 4-Way Flat. Plugs into USCAR socket to provide a 7-way RV blade connector. This provides all you need to connect a trailer to the tow vehicle. Generous length allows..