BTW, on my old project, I ran 17" x 11" wheels on the back of that car. I did not beat on the tub much, but they did rub. Particularly on the fender lip. Rolling it would help (which I did not do), but I don't think you could really have the car sitting 'low' without some rub. It's just too tight in there. Of course, beating on the inner tub would help some too.
