Matt_
I'm "nobody" to Rob...
I've talked to a few guys over on GMFS and the consensus is that I need at least a 6in lift.
You are right about those guys though...they think a 20x10 is narrow. It seems like they are all about 20x12.
And they all run 31x13.5x20s on those 20x12s with 8" lift in front and 6" lift in rear



