I had a chance to get out and get the new KO2s dirty this weekend. I didn't notice any highway hum from them, a little on some secondary roads, it seems to depend on the road more than the speed. Did about 50 miles of forest service roads, mostly wet and muddy. No problems in the 3-4" of mud in places, even going uphill in 2 wheel drive - not a huge challenge, but not bad. These tires do seem to have less tendency for the back end to wander on washboard roads, less than the Hancook ATM or Wild Country XTX tires that were on this Tahoe, no changes to the vehicle from the XTX tires other than new tires.
We did get onto one rocky trail, up a 20+ degree slope according to the XClinometer app (about a 40% grade). Wet, slick, round rocks. Crawled about 1/4 of the way up this first slope before I started thinking about how crappy it would be to back all the way down if it didn't go through at the top and decided discretion was the better part of valor, especially since I was solo. A little bit of tire spin in 4 low but not too bad, even with the tires inflated to a rock hard 40 psi. I would have aired down, but my compressor is broken and I didn't have a way to air back up.
I would have liked to try them in snow, but we're having a terrible year for it and FS roads that normally would have had feet of snow had none at all.
Seat of the pants judgement is the KO2 is a noticeable step up from the ATM or XTX I've had in the past, no regrets on buying these - yet.
