2005 Winnebago Adventurer w/ Michelin 235/80 R22.5 tires. What tire pressure is recommended for a fully loaded motorhome? I have had several "suggestions" from RV repair facilities.
Tire pressure/weight tables are set up for actual weights.
If you are close to your axle's GAWR, then use the PSI recommendation on the plaque likely near the driver's area that lists GAWR's, tire size and PSI.
Longer term answer is get it weighted and set pressures accordingly.