I drive a 32' Itasca Cambria. I keep the tire pressure at 80 psi and the air bladder bags at 35 psi. When we are driving the RV seems to feel every asphalt repair, expansion joints, road damage, etc. ...
My 1990 Winnebago Warrior has rims that are clearly marked "65 PSI Max". My door sticker says 65 PSI rear, 58 PSI front. I use Load rated E tires but their loads are de-rated due to the PSI limitations of my rims.