No, you are misinformed. Many of the common AT tires that people on this site buy can be had in 6 ply as well as 10 ply. In fact, some are even available in 4 ply. The AT tires I recently put on my Limited are 4 ply. They ride just as smoothly as the factory original 22" Goodyears that came on the truck. I considered that I really don't intend to take this truck off-road so I went with the 4 ply AT tires. In case anyone is wondering, they are Les Schwab Open Range Offroad tires, made by Mazama Tires for Les Schwab. And are available in 4, 6, and 10 ply. Of course the different load ranges are dependent on tire size. The tires I bought are 275/65/18.