In my experience, towing products are the most widely abused items on the road with improper trailer loading and running height being the most common issues, along with using balls of a lower rating or not having a rating marked at all. Also not having a spare trailer tire or the equipment to change it; I think most of us see these folks on the side of the road often. I have also experienced a tow dolly incident that had old automotive rated tires on it instead of trailer rated , towing a SUV and being stuck in the middle of nowhere at O dark thirty on the side of a highway.
One day on the way home and in a bit of a hurry, I was following behind an older truck towing a classic 60s car on a trailer. We were going down a long hill and they were going slower than I wanted. I started to pass about the time the trailer made a twitch to the left. As I backed off and got further back, the trailer started twitching a bit more and I knew the guy was headed for trouble. It did not take long for the trailer to start swaying all over the road and they lost it a few seconds later and rolled onto the rigs side and landed next to large tree. I went back to check on the folks and the driver was cussing about just got the car out of the paint shop....
I have no idea what the exact cause of the accident was but suspect the truck was underrated for the load, with the trailer either not having working brakes/brake controller or the driver not knowing how to handle the situation.
