It'd help to know which tire size you're running. If they're the LT225/75R16(E) that the Michelin chart suggests, then your weights call for 50-PSI front and rear just as you said. If your coach was loaded as you expect it to be loaded, on actual trips, then 50 is what the pressures should be. And, from the chart, 50 is not the lowest they allow for inflation pressure. You should be fine if your weight is based on the proper loading.
And to know what you're driving, too. Year, Make, Model. I can only repeat, EMPHATICALLY, that overpressure in front tires, especially on a Ford, is bad news for handling.
EDIT: Oh, forgot. Tires are standardized. That means that if the size and load range are an exact match to one manufacturer's chart (like Michelin), it can be used for another brand (like BFG or Hankook). A Michelin may outlast another brand or ride better, but the inflations should be the same.