Hitch weight

naturist wrote:
But seriously, I'm guessing that the 4,000 lbs for the Jeep is "dry weight," which does not include driver, fuel, maps, and other stuff. If so, add 7.8 lbs per gallon for the fuel in the tank to that number

Actually it looks like curb weight, which would include fuel. And since it's being towed, there's no driver. May be other stuff though. (Maps, floor mats, etc.)
http://www.edmunds.com/jeep/cherokee/2015/?tab-id=specs-tab

You would probably get better answers on the Motorhome or Dinghy towing forums.
Now, I am not a motorhome guy and they may use different terminology.
Are you talking about Hitch Weight (The amount of weight the hitch is rated to carry)
Or are you talking about towing capacity,(the amount of weight your MH is rated to tow?)
If you put your jeep on a dolly the weight on the MH hitch will be maybe 5 or 600 lbs.
The weight of what you are towing will be 4200 for the jeep and whatever the dolly weighs.
If you are towing 4 down the weight on the hitch will be ten pounds or so
your towing weight will be the 4200 of the Jeep.
You must know exactly what you are talking about and you need to use the proper terminology.

Your motorhome is more than strong enough for that Jeep. Even if the Jeep is 4,200 pounds, it is fine.

It is gas engine motorhomes that have a problem, only when they are very long, and only when the factory installed frame extension is not very strong. Many times the manufacture limits all motorhomes to one weight rating, due to the really long ones having a limit due to the overall weight and due to long frame extensions that are weak.

My 30E Bounder has a 190" wheelbase and about 10' behind the rear axle, with a 18" long frame extension due to the bumper being behind the rear of the factory frame. The 38' Bounder of 1997 also has a 190" wheelbase, and 48" behind the rear axle is the tag axle, and then a 9 foot long extension is welded to the back of the Ford frame. So the hitch is attached to that, and 'could' tow a limited amount of weight, and Fleetwood decided to limit all of their 1997 Motorhomes to 3,500 pounds.

Good luck,

Fred.

If you want to be safe, have a class IV hitch installed then you can pull 10,000 pounds. It is silly that a class II hitch is installed on a DP.

Probably, but only if you drain the fuel tank and put NOTHING by way of "personal effects" in it. Just guessing.

But seriously, I'm guessing that the 4,000 lbs for the Jeep is "dry weight," which does not include driver, fuel, maps, and other stuff. If so, add 7.8 lbs per gallon for the fuel in the tank to that number, plus a hundred or so lbs for those maps and misc junk folks keep in their cars.