Just because someone knows the GVWR doesn't mean you aren't heavier. Load the RV with the most stuff you ever plan to carry then get on a scale - Truck scale or check local building supply or sand & gravel pit. learn your ACTUAL weigh.
Tire capacity should be a MINIMUM of 115% of the actual loading. Tandem axle trailers should shoot for 120% and theyshould run the pressure molded on the tire sidewall. Read my RV Tire blog for more info
Retired Design & Quality Tire Engineer. Check out my tire Blog
for over 300 in-depth posts on tires, valves, and TPMS. I give seminars on RV tires various RV events for FMCA across America.