You only need to relocate the bumpstops if you remove the bumpstop bracket spot welded into the inner fender well. The reason being, your bumpstop no longer will lines up with what remains with the bracket removed and is likely to allow metal to metal contact if you bottom out. The relocation just shifts the bumpstop under the unibody frame support to make full contact.
Now if you run something as wide as a 315, I'd recommend removing that bracket. Here's how I did it.
