The tow bar manufacturers state the allowable difference between the motorhome hitch height and the height of the connection on the towed vehicle for each style of towbar.
Measure the centerline height of your coach's hitch, the height of your Jeep's bumper, and call the tow bar manufacturer. The manufacturer should know the height of his brackets compared to your bumper and can figure the net difference.
If the height difference is too much, they may allow a dropped or raised drawbar to be used with the towbar.
As an example, in our case, the allowable height difference is 3 inches.
2011 Sunseeker 3100
1997 Pathfinder Toad