Before you can and should do anything, your first stop should be at a truck scale. Pilot/Flying J, moving companies, grain elevators, google your location for a "public scale". Have your coach loaded as you would when you're traveling. Weigh the coach, four corners are best but each axle will suffice for now. Once you have your weight ticket, consult Michelin's tire inflation table and adjust the air pressure accordingly. My guess is your tires are way over inflated which is not as bad as under inflated but close. I'm guessing the table will show your PSI should be around 80PSI.....keep us posted after you get your coach weighed....Dennis