I found the placard stating tire pressures. It says front and rear 80psi. Does that sound right for a 32 foot Thor?
If yours is a Class C on the E450 chassis then that is the factory rate. Load range E tires normally max out at 80 psi cold. I have a Thor Chateau 31E which is 32 feet on the E450 chassis and 80 psi is what I use.