It would be best if you could get individual axle weights (fully loaded for travel) and then refer to the tire manufacturers charts, adding 5 to 10 lbs to allow for possible weight differences side to side. (Individual weights, on each side of each axle would be even better. In that case, use the pressure dictated for the tire with the highest load for both sides). It is entirely possible that the tires on each individual axle may require different pressure for maximum comfort and performance.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad