I noticed you said the tire that was giving you problems was a Carlisle. I read on a different forum that Carlisle tires are made in China and they are to be avoided like tje plague for anything bigger than a wheelbarrow. Although I would avoid them for that usage as well as my wheelbarrow has tubes in both wheels since the Carlisle tires on it will not hold pressure due to multiple pinholes that had shown up by "snoop" application.
I also like to thank Tom King for the info about tires as I may be looking at replacing my own.
From what I hear from tire retailers around here, almost ALL the ST tires anymore are made in China...no diff anymore...