7-Way Trailer Connector Needed for 2015 Ford F-150 7-Way Trailer Connector Needed for 2015 Ford F-150. Another installation kit you can look at is the Reese Fifth Wheel Custom Base Rails and Outboard Installation Kit # RP56034-53. This kit will have a much easier installation because of the outboard rails. 2015 Ford F-150 Trailer Wiring | etrailer Call 800-298-8924 to get Expert Service ordering a Trailer Wiring for your 2015 Ford F-150. Complete installation instructions and lifetime technical support on all Trailer Wiring purchases. Lowest price guarantee on accessories for your Ford F-150 and the fastest shipping available.