You need to remember that the ST tires depending on the weight of your RV, are pretty much living on the edge. You blow one tire, now all the weight on that side is resting on that one tire. That seems to be why people can have two blowouts. Not surprised after 15,000 miles the second one had a blowout.
You can not always judge tires on how they look on the outside. It's what you can't see that on the inside is sometimes the concern.
Glad that you are all safe and that your only damage was minor and your wallet got lighter.
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