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.
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