I'm running the 315 BFG ATs on the stock chrome 17x8 rims with no rubbing, even at full articulation. I do have a 2" spacer, but that just jacks your stance up 2" at rest. It does not lower the bump stops, so it doesn't stop the truck from bottoming out to the stock level. If they fit with a 2" leveler, they will fit stock.
My 315s do come very close. I would be worried that they will rub with an aftermarket wheel since all the aftermarket wheels I've looked at set the tire further out than stock and will move the tire further back in the wheel well during a turn. If you can get a wheel with close-to-stock specs (offset and width) you should be fine.
I know what your saying about the deal on those BFG 315s. Not only that, I've been impressed with their all around performance in mud and snow (even though I'm a Mud Terrain fan).