I do have an option for you that will allow you to not have to splice into your taillights, but we do not have a product that is similar to the Leer 300200 harness.
The Tekonsha T-One Vehicle Wiring Harness # 118384 will connect in line of the factory 7-way already on your F-150. This gives you a 4-way flat trailer connector. To that you can attach the Wesbar 4-Pole Flat Connector w/ Jacketed Cable # W787270. This cable gives you a place to disconnect your wiring if you need to remove... view full answer...