Hiker,
I have the Grizzly rims on my YJ and I run 33x10.50 BFG MT. They work great for me and should for you as well. Like graewulf said, you'll expose the sidewalls more the wider you get, but you also help keep the bead on the wheel with a wide tire on a narrow rim. I have some friends that even run 12.50 wide tires on 7" wide rims. I would only recommend this with tires of significant sidewall strength. Hope that helps.
C