Purchased the HD a few weeks ago. I searched extensively and could find nothing comparing the RH & HD except on the page you referenced.."In real world testing, the Radial TrailHD showed a 10% improvement in tire life over the Radial TrailRH, giving you a longer lasting trailer tire."
Just trusting Carlisle.
ETA: I'm a HUGE fan of Discount Tire. Always received excellent service, good prices and tons of locations.
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2006 Keystone Montana 3400RL, Carlisle Radial Trail HD
2016 GMC 3500HD 4x4 LB CC Duramax/Allison
B&W Turnoverball + B&W Companion Hitch
1998 Key West 1720
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