Have run AT's for many years in the winter on a couple of different trucks, as mentioned they suck as snow tires.
If you don't want to get a separate set of rims to run dedicated snow tires, what I've done is run studless snow tires and live with the fact that they wear out a little bit faster when run year round considering the savings of not having a second set of rims.
Depending on how many miles you drive a year, and assuming you don't drive like a teenager, I find I'd get 2-3 winters out of the studless winter tires run year round (30-40k). Note the softer grippier compound wears out before you hit the wear indicators on the tires. Ideally if you put them on at the start of winter you get two winters of good traction, and the third they start falling off. I haven't had any issues running the winter tires in the summer.
