I just replaced the Michelin LTX MS2's on my TV with the LTX AT2's. I noticed on the way home they were roadwalking and in general not as solid as the MS2. I took it to the shop and had it aligned, it was toed in too much. After that no problem. He said anytime you get new tires have it aligned, makes sense to me. Besides the fact it needs checking I really don't want to ruin $1k worth of tires because it wasn't aligned.
FWIW the MS2's had 7/32 (15/32 new) of tread left after 45k mi. Still a lot of life left but I changed the height(65-70)for higher weight rating.