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. ...
Tire pressure s/b based on weight of the rig not what's on the side wall. Have the rig weighed and then use one of the charts published by Tire Mfg to set the correct pressure - my Class C rear tires are set closer to 65 than 80 and that's based on the weight on my rig.