When I put 275/70/17 on my stock Sport wheels it rubbed on my upper control arm slightly
I went to aftermarket wheels to gain space for wider tires (although I had to do a cab mount chop as to not rub at that point)
Maybe try Todd Askins over at Tactical Distributors/ADS to try and get into the contract relm?
http://www.linkedin.com/pub/todd-askins/12/a02/286?_mSplash=1