tire pressure class c

we have a class C forum. Ask a mod/adm to move your question over there.
I betcha' you'll get more answers from those who have that size MH.

A tire pressure on the vehicles tire placard is good for a certain weight and a certain tire size/load range. If the tires have been changed to a different size/load range then the placard won't work. Get the units axle weights and use the tire mfg pressure/load charts for best tire pressures.

"Follow the manufacture's label. They know more about their vehicle than we do."

No, they don't,

They have no clue how you will load. The ONLY way to properly inflate your tires is to load the rig as you would for a given trip and take it to the CAT scale. Don't forget to include the weight of your tanks, fresh, gray and black. Keep in mind that your actual weight can vary greatly from trip to trip and while a return to the CAT scale is not essential every time you will have a pretty good handle on what you are actually hauling.{it is probably a lot more than you think}.

Once you know what the rig actually weighs go to the inflation load tables from the manufacturer of your tires and follow those numbers. Blindly following the numbers on the door sticker or worse, inflating to the maximum on the sidewalls is a recipe for disaster.

While most folks leave with empty black and gray tanks not everyone gets to come home that way. Often, on weekends, especially on holiday weekends, the line at the dump station may be hours long. If you choose to drive home with full tanks you have added a lot of extra weight.
some folks run with a full fresh water tank while others assume they can just fill up when they get to the CG, either way that weight {coming/going} needs to be factored into the the load your tires are subject to.

:C

If and when you get actual axle weights for your rig as set up for your use, you can use them. Until then, the door sticker pressures are a reasonable start; they assume the axles are at full gross weight, and you're probably not too far off of that, at least not enough to make a vast difference in the proper tire pressures.

The C manufacturer knows best.

Follow the manufacture's label. They know more about their vehicle than we do.