I just picked up a 2013 3500hd Ltz dually to make a tow pig for lmm. Looking into putting a lift on it and 33-35's. I was looking at the zone 5". Is anyone running one? Did you have to use front wheel spacers to use 17" wheels and what needed to be done to use the rear blocks. I'm guessing I'll need u bolts made. Post pictures if possible. Thanks a lot.