Lessons learned. When you get a flat on your trailer, don't settle for mismatched tire sizes. Any Mergen situations, you make do with what you can get. In this case, the trailer tire torn to shreds was replaced by a car tire with a lower profile. That is OK none emergency we are not going very far, but with hundreds of miles to get home, the imbalance simply shredded the other trailer tire to within an inch of its life. Now you need to trailer tires. And since the other two were fairly worn anyway, it just made sense to get four new trailer tires.