Personally, I think you are fine with the 30" tires you are running now. I have heard that you can run up to 31" tires without a lift but it looks awful close to me. In fact, it almost looks wewird without at least a minimal amount of lift. I have a 3.5" suspension lift and 1" body lift and run 33" x 12.50" tires and I HATE them ! I'm going to switch back to 31" tires. As a rule: " everything in moderation ".