I have a 2014 sierra all terrain. I plan on doing a 4" lift, like the one by ready lift or another like that. The ones with the spacer and upper a arm in the front and blocks in the rear, not the full blown all new suspension like the 6" lift. I've seen some companies say you can clear 35's and some say 33's. My question is, can I clear 295/60/20 trail grapplers without major trimming? If so, what offset and backspacing wheel should I use?