285/30/18 Will work on a 9.5 inch wheel. Now offsets is what may cause you to rub. Its more about the offset. I've also run Falkens which I hear have a sidewall that is forgiving when going with bigger sizes.

hey bro, i just bought some new wheels, and my rear is 18x9.5. can i run 285/30/18 without any problems?? and without fender rolling??