Did the truck already come with a 7 pin trailer connection at the rear bumper? Mine didn't but it came with the harness on the frame for one to be added. I ended up needing to cut and switch two wires in the 7 pin so that my trailer brakes weren't on constantly. E trailer said this was a common issue with the Nissans and the 7 pin harness, if it's that common I don't know why there hasn't been an update..