Well Bill, that's a hellofa good question. I wish I had an answer for you but I don't.
The problem is tire manufactures can play games with their tires. Case in point. I had a set of Generals on my old diesel. They went 65K and were cheap tires.
I thought hellya, I'm going to buy these forever. GREAT tire. So I bought another set, except they weren't so cheap anymore and after only 20K they are looking pretty sad. Maybe only 10K left in them. :M
It was pretty obvious to me that they changed to formula to a softer compound and now they are pretty much a junk tire IMHO. :M How is a person to know? By the time you get a good recommendation from a friend they go and change the formula on a person and the tires are junk.
So on my Duramax I bought some Bridgestones. They are a commercial highway type of tire. They said 100K no problem. Well I got around 30K on them and I don't think they will make another 30K. :M So far short of their 100K goal. :M On a good note the sidewalls don't have that wimpy look to them and I don't think they will crack in a 100 years. (Could be wrong about that though?) They also weigh like lead. They are SUPER heavy so they must have a lot of steel in them. I might even cap them I like the casing so much.
All in all I might give Toyo a try next time I need tires for my truck. I hear good things about them........but you know how that goes. :R
Anyway, I don't have an answer for you. If you find one let me know. :B