Until you get the coach weighted, to the left of the driver's seat on the wall should be two labels. One of the labels will give you the recommended tire pressure based on gross axle weight rating (GAWR). In my case for my coach the recommended pressure is 90 PSI and based on my weight that is what Michelin also recommends for my 22.5 inch tires.
If you have Michelin tires their web site has a table for all tires sizes and air pressure recommendations based on weight.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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