I am running Kumho Road Venture AT's on my truck as well as the Ecsta ASX's one of my Mustangs, a really good tire for the price. The main reason they keep their price low is the lack of advertising expense. I have put about 5k on them now and no problems yet, and grab just about anything i throw at them, including the recent snow. Mud seems not an issue, no clogging so far either.