My buddy just put 37x12.50x17 Mickey Thompson MTZ's on his 2012 JKU. They look mean, perform well, and are quiet on the road. They might be a good alternative. I don't know much about the KM2's, so no real answers to your questions.
92 YJ, 4.0, 5" BDS springs, 1" booms, 1" BL, 35x12.50x15 MTZ's, Ford 8.8 with LSD, 4.10 gears. It's never done though.