When purchasing tires for your truck I recommend you buy the 10 ply. I needed a set and had been running Michelins, they came on the truck. Got talked into buying a 6 ply tire and man what a difference a few "ply's" make. Truck feels like it's swaying off the road with the trailer hooked to it. Now I know what happened to me a couple years ago when I got the tail wagging experience one day. Going this morning and getting another set put on, this time 10 ply.