I just took a set of AT2's off my Nissan Frontier and put on a set of Cooper AT3's. So I've got a very similar platform as you.
The AT2's made it 60K. So did the OEM BFG tires. I was not that impressed with the snow grip on the AT2's, but I'll admit I had high expectations due to their snowflake rating. I don't think they were any better than the OEM BFG's. They also got quite loud towards the end of their life. I'll rate them as OK, got good life out of them, but not a tire I wanted to put back on my truck.
My AT3's ride is noticeably softer, but not sloppy. I'm not bouncing around like I did on the AT2's. They are also much quieter, but I've only got 5K miles on them. Haven't been through a winter yet to comment on snow traction. So far, I much prefer them to the AT2. Winter will be the final judge though.