I'm running a 72 duster, stock width 8 3/4, relocated springs, and tubbed. I have 28x11.5 et drags and 28x12.5 sportsman pros on 15x10 weld wheel with 6.5" back space. The car sits low and no rubbing or trimming the outer lip. There's a couple inches between the leaf spring and the tire if done right could be more room for wider tire. Problem is 28 is tallest I can go and they don't make anything wider that's that height.