What are your opinions on these tires? I'm looking to get a set for my 08 Duramax. I'm looking at the open country MT, or the M55's. Anybody with any experiance with these tires care to comment on them? How many miles do you get on average out of a set. There's no lift, so I'll be running 285-75-16. I might be able to get 295's under it. I'll check when I get there.