Toyota RAV4 Trailer Wiring | etrailer Curt T-Connector Vehicle Wiring Harness Installation - 2018 Toyota RAV4. Today in our 2018 Toyota RAV4, we're going to be taking a look at, and showing you how to install, the CURT T-connector vehicle wiring harness with a four pole flat trailer connector. 2019 Toyota RAV4 Trailer Wiring | etrailer Fastest shipping available and a lowest price 2019 Toyota RAV4 trailer wiring guarantee. Expert lifetime technical support on all purchases. Complete 2019 Toyota RAV4 Trailer Wiring installation instructions and customer reviews. Call 800-298-8924 to place your order or order online at etrailer.