truck tire choices

I have Cooper AT3s on my B+ R-Vision (Chevy G3500 2006) with 8500 miles on them. I noticed over the 4th of July weekend they developed some road noise. I just checked them out and I have never seen so much cupping on a tire before. It looks like the tread is separating throughout the contact surface (both fronts). The last set of tires were michelins that were replaced due to sidewall cracking and had no cupping. I felt I should share. I will take this to my tire dealer on Friday for evaluation. I would post a picture but it is only allowing me to share URLs.