Buliwyf
Viking with a Hammer
One nice thing about the 7.3/4.3 Tremor is that it is also available for the non-Tremors. I was able to order my F-350 from the factory with the 4.30 rear end which will make going to bigger tires easy.
That might be an option as well. XL, 7.3/4.30, Fx4.