Is yours a dually?My 285's measure exactly 32" when installed on the truck. They clear on the rear no problem and had a slight rub on the front, but with minor (very very minor) massaging they clear no problem.
They are concerned with the tires rubbing against each other because the tires are too wide.
We know a 3/4 ton and 1 ton can clear 33" tires no problem, the issue is having enough space between the dual tires.



. Mines a 454 also, but a SRW.