Glenn, thanks for all the great info. It has been enlightening.
KC4KM, we had one blowout but it was not on the Montana. It was on our 1999 Jayco Eagle 255BH. We were very fortunate a guy behind us passed and informed us of the blowout immediately after it happened so we were able to stop right away. We had no damage other than to the tire. Here's a picture of that blowout.
The rest of our tire problems have been defects that in most cases caused a tire to go down while we were parked in an rv park. But I've seen some of the damage a blowout can do. You are correct, a blowout can cause some expensive damage.