I put 30,000 miles on my set of KM2's before replacing them. We live on a gumbo mud road, for the last 1-1/2 miles to our drive. Prior to that 1-1/2 miles lies 5-1/2 miles of a combination of mud and gravel. The KM2's never let me down, when we wanted to go anywhere/any time, we went. They were a bit squirmy when they were new but that was expected because of the tall segments. I never had a problem and I did rotate them as close to every 5,000 miles as possible. I believe they were good for several thousand more miles when I got new tires. The reason I didn't get another set of KM2's is because we have improved the road significantly so I went with something less agressive. I would highly recommend the KM2's where conditions are so severe that just getting around is a challenge.