That is a good comment and why the dealers tell you to use an ST tire for trailers. But, in real world testing, I had a them take off a Hercules ST tire I had purchased to get me through my trip and to the tire dealer to replace all 4. When not mounted with my hands I could flex the ST tire, and couldn't with the LT. I'm sure all tires are different. Also considered Sailun tires, but found them to be more expensive than the LT tires I went with and didn't want to go to Walmart for service. Felt more comfortable working with a tire shop vs a chain store.