j-d wrote:
If your original tires were Load Range D, then you should not run more than 65PSI in your current Load Range E tires. So many inflate to the sidewall max, or 80PSI in Load Range E.
Just weigh your coach and inflate to the pressure indicated in the Load/Pressure charts available on the web. Doesn't have to be for your BRAND, just for a TIRE with the same specs as yours.
It's VERY common to replace "D" tires with "E" as they are much more common. I doubt the load range is the source of your rough ride. I believe it's
1. the fact it's a Class C "Cube Van" RV
2. more air pressure than your axle weights call for
X2 My load range E tires are Max 80 psi but my rims are max 65 psi