13Pin To 7Pin Adapter, 12V Trailer Adapter Plug For RV - Walmart.com
Amazon.com: WESTFALIA Automotive Adaptor 7-pin to 13-pin to Connect 7pin Socket on The Vehicle to 13pin Socket on The Trailer or Bike Carrier : Automotive
BIG CLEARENCE Thule 990600 - Adapter - 13/7 Pin - black - Private Sport Shop
Ring 13 Pin Plug to7 Pin Socket Adapter | Halfords UK