Am I off-base in my thinking about a 10 or 12 inch wide tire?
Correct me if I'm wrong, but
I think you meant 10 or 12 inch
wheel.
The Banks sidewinder that was featured on Extreme 4x4 had the Kore setup with 20x10 Weld velocity wheels with the standard 4-5" backspace. As you probably know, the Race system lifts the front only about 2. 5". They made the wheels work by trimming the fenders and the leading edge of the bumper. It looked like they trimmed about 1" off of the rear part of the wheel well opening. You can call Banks and see if you can get a set of their fenders, but when I called about 8 months ago, noone knew much about anything on that truck.
I asked a local body guy that does great work about trimming the fenders on my truck, and he recommended I not do it because of the expense and other options I had for making 35's work. I ended up going with the KORE/Weld wheels, the Pace (now Recon) system, and 35" Toyo's, no rubbing, and I was very happy with the setup. I really hated to sell that system, but maybe I'll get the Ultimate Race System next!
If you can stomach it, a compromise might be to get 18" wheels and less lift with the proper offset. I hate compromising though.
Here's a motto for ya:
There's no monetary reason that any problem can't be solved. It's just a matter of whether or not you want to spend the money to accomplish what you want.