I had 16" "E" Goodyear Marathons and they lasted 3years. Two blew within 100 miles. Each rear tire took out the body metal on each side. The tire company that I used for replacements, does business with camping world said the common cause is sitting a long time causes flat spots. My fiver sat for about 8 months prior to this trip. It normally doesn't sit that long. I checked the air and inspected all tires. Wasn't carrying any thing heavy other than 1/2 tank water for rest stops.