Here is how I set up our 2011 JKU Rubicon for flat-towing. It has 35" tires and tows great. I didn't want to use the "D" ring adapters from Warrior Products because my bumper was too high off of the ground and I didn't want to build any higher of a riser coming off of the coach than I already have.
I also used the towbar crossmember to aid in protecting the sway bar disconnect actuator as I feel it is a little unprotected from the factory.
All in all it tows great, we have towed it about 3k miles so far this summer. If we are going for extended stays we haul it in our 26' Haulmark Edge race trailer so we can take the Harley as well.
I understand your concern about flat-towing as I have a few rock chips on the front from when we went to West Yellowstone two weeks ago. It was fine until we hit a 5-mile section of Hwy20 in Idaho that they were in the middle of graveling and tarring. I was not a happy camper but at that point there was not much we could have done. At that point I was wishing we would have hauled the Jeep in the trailer.
Here is a link to another RV forum that shows the construction of my towbar bracket/crossmber.
RV.Net Open Roads Forum: Dinghy Towing: My Towbar/Protection Bracket
Let me know if you think that will work and if I can be of any assistance.