I'm fixing to purchase new tires for my 2001 GMC Sierra Z71. I now have the Yokahama Geolander ATS 10 PLy and man does it ride rough. I been looking at the Hankook Dynapro's ATM's. They come in 4 ply and 10 ply but tires look exactly the same. My question is does the PLY have anything to do with like having punctures and stuff like that or is it just the load ratings? Only thing I ever haul is my four wheeler. If it makes no differance I'm gonna go with the 4 ply because there much cheaper. Thanks for any advise.