2016 Toyota RAV4 Trailer Wiring | etrailer Fastest shipping available and a lowest price 2016 Toyota RAV4 trailer wiring guarantee. Expert lifetime technical support on all purchases. Complete 2016 Toyota RAV4 Trailer Wiring installation instructions and customer reviews. Call 800-298-8924 to place your order or order online at etrailer. Trailer Wiring Harness Installation - 2016 Toyota RAV4 How to Install a Trailer Wiring Harness on a 2016 Toyota RAV4. Today on our 2016 Toyota RAV4 we're going to be taking a look at and also showing you how to install the Curt T-Connector Vehicle Wiring Harness with the 4 Pole Flat Trailer Connector.