After lots of researching and discussions in this forum I pulled the trigger on Nitto Grappler G2 E-rated for my RAM 2500. This was about 2 years and 24K miles ago. Regular rotations. Did well until this past month. Tread separation on 2 tires so far. Luckily I caught it before taking out a fender or bedside. Have the certs from Discount and they have treated me fairly thru this. They are working with Nitto to see if the other 2 will be replaced as well. I expect that to be at minimal cost to me. Otherwise I will be writing off Nitto from my preferred choice. I'll update this update once I find out what Nitto comes back with.