[Shamu406]

I have a 1996 Newell, and a 2015 Jeep Rubicon Hard Rock 4 door as a toad, a 10k Blue Ox tow system with a 10" rise hitch and it works great, and the tow bar is level. The Jeep has a 3" Terraflex 8 bar fully adjustable lift, Falcon Reservoir shocks, and 17" Fuel wheels on 35" Toyo Open Country tires. Not sure why your tow bar is so unlevel? Did not think 1/2 inch lift difference and 2 inch difference in tire size would throw it off that much. Is your ride height on your coach correct? Is there room to raise it?
What shocks do you have on the Jeep? Are they adjustable? Consider shorter shocks to help?
What tow system do you have? Where is your tow bar located, under or over your front bumper?