I've heard in the past that these were great tires. However, I did a recent search and found lots of complaints that they wear out quickly. Some complained that they didn't even last 20K miles. I'm especially interested in the "XTREME" versions, but I'm concerned about ride quality and wear. It doesnt say anything on the Toyo website, but I've been told that the "XTreme" versions have 3-ply sidewalls. Is this true? Could the complaints be about the non-"XTreme" versions? I once had Nitto's with 3-ply sidewalls and the ride was pretty harsh. How is the ride quality of the Toyo "XTremes"?