We bought a 1977 F250. Just because I guess, because we didn't need it. At sometime I'm sure it will see pop up towing duties. It has an old Energizer brake controller mounted in it, not sure why because there is no 7 pin plug and the blue (brake?) wire is capped near the back of the truck. In the midst of sorting out the hack job trailer light wiring at the back of the truck now, and wondering if it just wouldn't be easier to start over. I have the P3 controller in the 4Runner, and simply bought a bracket and harness for the Armada. Should I just run wiring from the controller to the back of the truck and be done with it? At least I'd know it worked then. Our pop up is only 2300lbs so I don't doubt that the truck would stop it, but I'd feel better having the brakes working.