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Our rig says to use 100lb on our 255/80-22.5 Michelin XRV tires. GVWR is 24K. We had it weighed and came in around 23K, fully loaded with everyone in the coach. I forget the exact numbers, but our front and back GAWR were nicely under by a very comfortable amount (I don’t have the sheet handy right now). The only thing I don’t know is the side-to-side, so I went with 15% margin above the actual weight.
Using the Michelin tire weight chart, I found I could run the tires at 90lbs and still have a pretty hefty safety margin (like 20%). We usually run about 93-95lbs and the ride is considerably smoother then at the 100 on the sticker.
So, you can possibly run lower than the sticker says, but you really don’t know unless you weigh it.
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