I have the KM2's on my pickup truck, and I have loved them offroad, but they were a lot louder than I had expected when putting them on; usually peoples first words when they get in my truck for a ride are along the lines of "holy *#}%, are those your tires that are that loud?"
I have about 40k miles on them from new and they are finally all but wore out. I found out early on that they are super picky about tire pressure. Granted my truck is something like ~9500 lbs or something though.
I think my next tire will be the Mickey Thompson Baja ATZ radial. Having said that, my truck is 85% highway/city miles, and 15 % offroad.