I found a post on another forum where the owner had a Chateau 31E weighed. This was with a full 55 gallons of fuel and the 40 gallon freshwater tank full.
Total weight was 14,620. (GVWR is 14,500.) Front axle was 4,580 and rear axle was 10,040. So the rear axle is already overloaded from the factory, and there is no payload capacity. You can dump 300 lbs of freshwater, but that only helps a little bit. We often camp at state parks that only have electric service, and we prefer to arrive with a full tank of clean filtered fresh water.
Also, Ford specifies that at least 1/3 of the vehicle weight should be on the front axle, but the RV builders don't build them that way.
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