So, update on the Coopers, after a quickie round-trip to Durango/Cortez.
First, they run =very= quiet, which I like.
Second, even with a fresh alignment (on the old tires) and a recheck (on the new Coopers), truck was a bit twitchy on the road. After talking to both GM and Discount, the fact that these tires have a =very= deep tread, and that the tread is very sharp and "grabby", leads me to believe that these tires just need to "wear in" a bit. I was feeling every seam in the road with a slight pull. Also, I know I need new shocks but didn't have time to get them on before this trip, so I'm thinking that will also help. I was towing a light FW, about 5-5.5k, so was running 70 psi in the tires.
So far, after not quite 1,000 miles, I'm happy. I'll update again after the new shocks in 2-3 weeks.
Lyle