I have a cargo rating of 2,734 pounds on my 30' 1997 Bounder. It has a 100 gallon fresh water tank (800 pounds) and 75 gallon gas tank, 15 gallon propane tank.
I checked the weight while on a 2 week vacation, with full fresh and gas tanks, and the weight was 16,500 pounds with 2 dogs and people inside. So I was using around 2,200 pounds of my cargo rating for people, dogs, and camping gear, water ect. I had stocked the refrigerator before going for 3 nights dry camping, then going home after that.
Remember the 5th wheel hitch itself will come in a 150 pound crate!
Good luck,
Fred.