Hey Kingofkerhonkson,
I just went through your process of trying to decide what type of bike rack is the best. I have owned roof tops, trunk lids and hitch models before and the Bronco is a bit unique as to what works best.
Due to it's height, a roof rack is not really feasible, plus I have run a few of my bikes into the entrances of underground parking as I have forgotten that it is up there.
All the tire mounted ones did not hold the bike securely, at least not to my liking. My bike is worth a lot, and having it move about on the tire is not too my liking.
That leaves the hitch models, and as DDM stated, a 2" extension will give you access to the rear of your Bronco, provided you buy a hitch rack that folds back.
The best hitch rack that I found, and ended up buying is the brand VelociRax. These racks, do not move at all in the hitch due to their very successful use of a anti-movement locking system. It folds back allowing for easy placement/removal of your bikes, and comes in 7, 6, 5, 4, and 3 bike models, and they are made in Utah. I would suggest that you check them out...
Hitch Bike Racks – VelociRAX
Deano Bronc, Bluestreak57