Don't overlook the tire size of 285/75/r18. They are available in quite a few of the popular tires (Toyos, Cooper, Nitto's, Goodyear, etc) and most are in the 34.8" diameter range but with a narrower 11.5" width. They are a taller, skinnier tire. So you get the benefit of additional ground clearance (and the look of a larger overall diameter) but with a narrower tread width - albeit wider than stock - which should result in lower rolling resistance than wider tires. Also, decreased weight. I'm looking at the Cooper AT3 XLT's in this size. They show 34.84" in diameter, 11.5" in width, 60lbs, load range E. Oh, and because of the narrower width, they are approved for 7.5" rims. Just throwing that out there.