KO3 outperform in the PNW
I've had the new KO3s on my 2013 RAM 1500 (leveled, 305/70R18 F) for just over a year and have ~4K miles on them. My first impression is that they're quiet and perform great in dry and wet conditions here in the greater Seattle area. I haven't had the chance to drive them in the snow yet, because we didn't have any last season on Snoqualmie Pass. I'm confident they'll perform above expectations in snow, but I'm less sure about compact snow and ice. I run them at 40 psi front and 38 psi rear. Yes, I know a F/12-ply is way overkill for a 1500 truck, but that was the only option in that size (35") tire. They do make a D/8-ply now in a 35X12.50-18, which weighs ~5 lbs less per tire than the 12-ply tire, which I would have preferred. I would stress that it's important you have a competent installer balance them with a modern tire balancer. At the first shop that mounted and balanced them, I had a high-speed vibration. I went to another shop that does more high-end car-truck tire and wheel installations, and they balanced them perfectly, and they run smoothly all the way to 100 mph. Good luck!