The BFG AT's are perfect for a DD vehicle that sees mostly highway miles. They work great in the snow(floatation), rocks(preferably dry), sand, etc. As mentioned they aren't the best for mud, but work well enough on muddy logging/forest service roads, and shallow mud(few inches deep)

The last set of AT's(non KO) lasted 70k miles and still had legal tread when I swapped for my current set of KO's. BFG doesn't offer a mileage warranty, but if you rotate them every 3500-5k, keep the alignment correct, you shouldn't have an issue w/tread wear. If you have one near you. America's Tire Store has a '"No Questions asked" replacement warranty(used to), which makes it nice when you puncture a sidewall on the trail.