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, D44/60, 5" BDS springs rear, SOA front, 1" booms, 1" BL, 35x12.50x15 MTZ's, 4.10 gears. It's never done though.