I have a hitch installed and have a wheelchair carrier attached. There is no-way I would ask the Moco for "permission"; I think that would be asking for trouble. I have dealt with dealers all over the country and have never had any problems using the ESP. Even when I blew out the engines bottom end, the Moco rep only bitched about my cams. He never mentioned the trailer hitch. BTW, the dealership did some sleight of hand about the SE cams installed and got the coverage to repair the bottom end and get me back OTR for $50.