I have about 1500 miles on my Carlisle 12 Ply Radial RH tires. I have not worried since I put them on, knowing that they had to better than the 10 ply Blowmax. I wish I had more miles to be able to show proof that one does NOT have to pay the GY G rated price to get out of the Blowmax. I will tell you that when I stood the 12 ply side by side with the 10 ply before I sold them, and there was NO comparison. The 12 ply stood tall and solid, and the 10 ply sagged and appeared inferior (no rims). I think I made a good decision, at about $651 for 4 mounted and balanced. I even went back later for the spare. The Sailun is 14 ply and was about the same price as the Carlisle. I wanted Sailun, but could not get them locally. IF you can afford it, go GY, IF you can't, try Carlisle or Sailun. But WE have to be able to use our investment (RV). It is not like Heartland is going to buy us new tires. I agree with EVERYONE that is disappointed that Heartland installed these tires on our new units. I got back some of my money selling my old tires on Craigslist. I have read that many have the same story on Craigslist.