I know my father has Hankook Dynapro MT RT03 on his 2003 Ford F250 7.3L PSD 4x4, LT315/75R16E (10-ply) and he has 45,000 miles and counting, with lots of tread left. They're getting a little noisy now, but they didn't make noise until about 35,000 miles. And they're a really aggressive mud terrain, with great sidewall tread (for airing down). He's probably gonna get 50,000 or 60,000 miles out of them, depending on how much he keeps them rotated until then. But I'd definitely buy them again. I was going to get some for my Tracker, since they make all sorts of sizes (30x9.50, 31x10.50, 33s, 35s, etc.) but the tire shop had a deal on 5 MT/Rs instead I had to jump at the opportunity. Anyways, the Hankooks are a great tire and I know he will buy them again cause of the aggressive tread, low noise, and high life. Not something I'd expect from an aggressive mud terrain.
Edit: plus I think they are fairly inexpensive. Since it is a foreign tire, though, they are taxed an extra 30% per tire due to recent legislation