I did the same thing as MWILSON, LTX A/S (E-rated) came on the truck as OEMs and replaced with same as I don't go mudding and the truck is not a daily driver but boy, do those tires wear like iron. Had 60k on first set but was towing my travel trailer across the country, tread was fine (probably 40%) but showing some small cracks on the sidewalls so changed them out anyway. I think the M/S2s are better in the wet and snow but, not seeing daily use and basically used for highway work, I went with the known entity. The A/S is certainly not a cheap or inferior tire in any way.