2019 Toyota Tundra Trailer Wiring | etrailer T-Connector works with fifth-wheel and gooseneck trailers and retains use of your vehicle's factory 7-way connector. It connects your factory 7-pole at the bumper to a new 7-pole in the truck bed. Adapter has a 90-degree angle for tight spaces. Toyota Tundra Trailer Wiring | etrailer Guaranteed fit Toyota Tundra Trailer Wiring. Lowest price guaranteed. Thousands of customer trailer wiring reviews, expert tips and recommendation. Lowest price guaranteed, easy online ordering at etrailer or call 800-298-8924.