The hitch is only rated at 5,000 lbs. Combined Gross Vehicle Weight (tow vehicle & towed vehicle) 26,000 lbs. These are the maximums. Everything is based on how much weight you put in the motorhome which is 22,000 Gross Vehicle Weight. If you reach that then you can only tow 4,000 lbs. The guide posted above will give you the specifics on how much cargo you can add. You need to remember to add the weight for on-board fresh water, water in the water heater 8.12 lbs per gallon, any waste water or black water in tanks, propane. It all adds up.
2007 Georgetown 370TS
aka - RAYNMKR