We run two 1 ton service trucks that weigh about 8500 pounds and have for 15 years. I've bought a lot of tires during that time - always 10 ply.
The problem we have had with cheap tires is that they shread, usually at speed on the freeway and usually at the worst possible time. I've been buying Michelins because they last 60K miles, ride nice and don't shread.
But they are expensive - very expensive. To try to cut the cost, I recently put a set of Yokahamas on one of the trucks. The tire guy says they're good performers and they cost less than the Michelins. 10K miles so far, they ride nice and haven't shreaded yet.
The Hankooks that came stock on my truck look like they will make 60K miles as well, but the ride quality is poor. At least they didn't shread.
Time will tell.
