I hope this will simplify things.
1. Download the tire pressure inflation chart for your brand of tire (I have Michelin).
2. Load the coach with your typical travelling weight.
3. Go to a truckstop ( I used TravelCenters of America), and have the coach weighed. I weighed mine while heading out on a trip so I didn't have to load it up specifically to weigh it.
4. Adjust pressures on each axle as per the chart.
By the way, I use 65 psi in the front (BT Cruiser 5270).
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