That is one of the sizes I am strongly considering in Toyo AT II's. In the leveling kit thread, http://www.gm-trucks.com/forums/topic/153363-2014-leveling-kits/page-39, those that have 275/70/18's with a 2.5" level, said there is a lot more room for a wider tire. I am also planning a 1.5" body lift as well when the time comes. But it sounds like it would work. Also, I am planning on running the stock Z71 wheels. The offset will be they key factor.