Dougy,
I run 33's on mine - with the front mudflaps still on the truck.
I had to put a spacer on the rear door for the spare though, as it wouldn't fit on the normal orientation as it hit the door and the rear bar. Mine are the factory alloys so I didn't want to turn the rim around...you may be able to do this and get away with it, but I still think you will need the spacer, as it lifts the tyre up, and spaces it out from the door.
Mic