thanks saillaw.. i am planning to have BFG on the steeliersIt depends on the tire... Most 285/75/16 say they require a min of 8" width rim. You would have to look up the particular tire to know for sure.
But, that being said, I used to run 285/75/16 on the stock 7" rim and had no problem with them. You probably want to keep the air pressure a little lower than you normally would to keep the center from wearing too quickly. But even on long desert trips at 12 psi I never had one roll off the rim.