I got a set of 7 cooper discoverer ATR 235/70/17 for my dually. I rotated them at least every 5,000 miles. I took a road trip in june made it all the way to MD and then to Detroit and had to replace the ones on the front wheels. They were way more gone than the rear four? I rotated properly except once on the trip. I only got about 20,000 miles all together on the tires. I think (know) my truck has some issues. I have every brace imaginable on the front end. 08 steering upgrade, Carli upgrade, BD steering brace, Even a new steering box. I drive a lot, really curvey roads up here in Northern Cali. But really 20,000 miles out of a set of tires. I know have the coopers up front and four toyo open country AT in the back. I am going to get 19. 5 commercial wheels and tires before I buy a new set of trash. I'm in on the war, Lets do this!!!!!!!