I agree that the E rated tires would ride better. I was just tired of babying my tires and I actually did have a blowout with the original E tires, although they were past their "use by" date. Everyone seemed to recommend the Sailuns, and I do like having a tough tire, but they may be too tough. I may try running at lower pressure, since they do provide a chart for pressure/weight. The rig can gross around 14,000, and I'm probably approaching that at times when we are loaded for a craft show. Thanks to all for the thoughts.