I have the LTX MS-2 Michelins on my F250, stock size and rating. I had balance problems too, in that they would balance fine with normal number of weights, I would drive for two weeks and then they would be out of balance. Get them balanced again, drive for a month, out of balance again. They finally stayed balanced after about 10K miles, my tire guy was getting quite fed up with me but every time they spun them to check they were quite out of balance. I also find they transfer road ripple quite badly, that little bit of road surface harshness that mimic's an unbalanced tire. I have one that pulls a fair bit whenever it is on the front during the rotation schedule. All in all not my favorite tires.