I was driving on I-15 Friday, southbound near Lehi, Utah. A vehicle in the lane to the right of me was towing a mid-size single axle flat-bed utility trailer. Suddenly I heard a loud explosion. In fact it was so loud, I felt it. My heart rate shot way up. Had I been shot? Had something hit my car? It was a seriously intense explosion. Ok..... but my car is still moving forward, steering is still responsive, suspension feels normal, acceleration works. Then I realized I was hearing that flap flap flap sound of someone driving on a blown out tire. The vehicle and trailer next to me were in full "please just get me off to the side without losing control" mode. The trailer had blown a tire. I watched in my rear view long enough to see the driver made it over to the right safely. He was lucky he didn't lose control; highway speeds along here are 70+MPH, and he was easily going with the flow. So this is a reminder to check your tires before your next tow. Check them now, in fact, so that if they're "done" you aren't tempted to use them anyway just because it's the day of the camping trip and you have no options. Replace them if necessary; don't give your fellow motorists heart attacks.