On a 1996 MH the door sticker could state 65PSI front and 60PSI rear tire pressures. That's what my 1995 Four Winds 21A motor home said. MY 1997 22RK Coachmen says the same thing. Those were for load range D tires. My 2014 Itasca says 80PSI front and 75 rear PSI but for load range E tires. In all cases those are the max recommended tire pressures. A couple of people in this thread have suggested the OP get his rig weighed,so he can fine tune his tire pressures to the weight he is actually carrying.