Need some help on tire replacement. Coach has had two sets of 275/80-22.5 over 17 years. She is in need of new tires and I would like to install the recommended tire sizes per the data plate. No one has been able to provide the proper size for the rear. The data plate lists a 19R22.5 for the rear and 10R22.5 for the front..The present rear tires I believe are over sized and there is a 5-6 mph difference with the GPS. My main concern though is when the air suspension system bleeds down the tires are touching inside the rear wheelwells. Please look at the data plate and give a recommendation.
The coach is a 36' Regency with 250HP Cat 3208 with 4 speed Allison. Total weight is 31,340lbs
Thanks, John and Robin, Jamestown, SC