My KINGDOM for a STICKY on this! Ford and Fleetwood applied stickers that cover the maximum weight designed into the unit (chassis for Ford, coach for Fleetwood). Highly unlikely that you can get near that loading in a 24-foot coach unless your camping trips include delivery of watermelons or car batteries.
Which is why we need a sticky. The correct answer to all this is to weigh your coach, configured, loaded, fueled, populated, for actual RV travel and use. If you have access to a scale that you can get the four corners onto individually, so much the better. But it's more than adequate to use the CAT Scale found at just about every Travel Center... Pilot/FlyingJ, Love's, T/A and all those. If you tow a vehicle or trailer, have it hitched up too. For $10 you get a legal- for-trade weight slip showing Steer, Drive (rear of your coach) and Trailer.
Take a tire pressure chart
such as Michelin's and adjust the pressure of the pair of fronts, and all four rears, to the numbers in the chart. You can use Michelin for other brands because the specs are industry standard. Notice the first two sizes are the ones discussed here and they ARE the same as Phil noted.
If your tires are hot by the time you get to the CAT scale, I suggest you use the charted numbers plus 05-PSI. Then adjust to what the chart says when the tires are cool and shaded the next day.
Which Chassis do you have, E350 or E450?