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  1. How to convert 4-way trailer wiring to 5-way on 2004 Sienna??

    I would like to add trailer brakes to my boat trailer. In the past, I have owned a boat trailer with disc brakes and a electric reverse backflow solenoid, that prevented the brakes from engaging when the vehicle was in reverse. This set-up worked great on the Tundra with the 7 way wiring. I...