I just got those Coopers too! They seem great so far! I got the 285/60/18s and they almost seem a little wider and lower profile than my old Nitto Terragrapplers of the same size. No problem fitting or rubbing with stock wheels and ride height. My thanks to Kat for her pictures too which pushed me over the edge. (the fact that I grew up in Central Arizona right near her and have driven those same dirt roads myself might have softened me up even more)
http://img407.imageshack.us/img407/157/img3883w.jpg
http://img266.imageshack.us/img266/5539/img3890.jpg
http://img442.imageshack.us/img442/9058/img3882.jpg