I installed this jack on my 16' car hauler and it works great. Attached red wire to 12V Aux pin and the black wire to the GND pin on my 7-pin trailer plug. All I have to do now is plug in my trailer plug to easily raise and lower my trailer tongue. I did have to rotate the jack so the switches face the passenger side of the vehicle to get clearance for my tailgate (2015 Silverado 2500). Should definitely have bought it sooner.