I'm planning on running 42's on my Suburban. I want to know what's the best back spacing to use so I don't rub the inner fenders (front rear) or stick out past the body too much. I plan on getting my hummer rims recentered and I only want to do it once. Other specs on the Sub are 6" suspension lift, 2" body lift, with generous fender trimming. I plan on losing the body lift, cutting the body somemore, and relocating the the axles out an inch each way. This things being set up to do the Con someday.