Tire Pressure

Since you probably will not weigh the rig the answer is the Maximum pressure on sidewall.
Inflating to max = increased tire wear but RV tires usually age out before they wear out.
Under-inflation = Sudden rapid loss of inflation otherwise known as a blowout.
You make the call

What Brett said.

FWIW, there are probably "daily" posts on this subject. It would probably be in your best interest to check some of them out by doing a search on the subject.

Ron

BEST answer: With the coach loaded the way you travel (with full fuel), weigh each wheel position and use the heavier wheel position to go to your tire manufacturer's Inflation table to determine the correct MINIMUM PSI. Perhaps add 5-10 PSI to that minimum.

Next best: Weight axles and go to the Inflation table. Add a little more for "fudge factor" to account for left/right imbalance.

Next best: Go with the pressures on your GVWR plaque (probably near driver's area) which is correct PSI if each axle is loaded to its maximum GAWR.

Worst (hopefully): What is on the sidewall of the tire.

Standard answer; load your coach for travel, including water, weigh your MH by 4 corners or at least by axle and go by the tire manufacturer's chart based on the weight per axle. That is the only way to get an accurate psi.

Follow the manufacturer's guide found inside the MH around the driver area.