What sizes of offroad tires can I have safely mounted on a set of 16" diameter 5" wide steel wheels? I'm weary of going too far out of manufacturers specs, so I was thinking of some 215/85-16's but if I could use 235/85-16's that would be better. Can I do that? How big could I go safely? Should I just cough up the dough and get wider wheels? Thanks for helping a n00b.