Vehicle Trailer Wiring Harness, Adapters and Connectors Custom fit vehicle trailer wiring harness are available for all makes of vehicles including Ford, Dodge, Chevy, Honda and Toyota. Trailer adapters, trailer connectors and wiring are available from Hoppy, Tow Ready, Pollak, Draw-Tite and Reese.Universal Fit Wiring · Trailer Side Connector · Vehicle Side Connectors · Wiring Adapters Amazon: trailer wiring harness adapter wwwon›Search›trailer wiring harness adapterSee all results for trailer wiring harness adapter. Hopkins 47345 4 Wire Flat Adapter. by Hopkins Towing Solutions. $9 $ 9 86 Prime. FREE Shipping on eligible orders. More Buying Choices. $6 (63 new offers) 4.7 out of 5 stars 492. Product Features Take the guesswork and frustration out of vehicle to trailer wiring.