Trailer Hitch Wiring Harness Kit For 18-22 BMW X3 Plug & Play | TrailerJacks.com
Stealth Hitches SHR31017/SHT25015 BMW X3 Tow Package Combo Hitch Receiver w/ 7-Way Round Trailer Wiring Harness
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BMW X3 4 pin to 7 pin trailer wire harness upgrade - YouTube
Adding an etrailer lighting kit to our BMW X3. - YouTube