Tow Wiring Harness - RV Upgrade Store Get the best deal from RV upgrade online store for Tow Wiring Harness. We offer a variety of Tow Wiring Harnesses at an affordable price. Visit our store TODAY. RV Dinghy-Tow Wiring Harnesses - curtmfg RV Harnesses CURT RV harnesses make it easy to connect and dinghy-tow your vehicle behind your RV. Each RV wiring harness is vehicle-specific and plugs into the existing wiring system to provide a standard 4-way flat for plugging into the RV socket. No cutting or splicing is required!