Originally Posted by mano
My MH calls for 60 psi front, 65 psi rear dual, max on tires 80psi, can I go up to 80psi in tires , say 70 psi as long as I do not go over 80 psi
I would imagine your motor home when new, came with D load rating tires which had a maximum of 65 psi. Your current tires are more than likely have an E load rating with a maximum of 80 psi.
More than likely 60 in the front and 65 in the rear is still the way to go. Weigh your motor and adjust your tire pressure to the weights in the following link Michelin Americas Truck Tire Load & Inflation Tables
and maybe add 5 psi or so for a cushion.
Many years ago I had a 22' Class C that came with D tires, which were eventually replaced with Es. The ride got so much rougher with the Es.