Towed Car Comes Loose - A Plus For Auxiliary Braking System

I also tossed those pins out and use padlocks. They mention the better style pin may have prevented this, and that's possible true if what really happened is the other pin just worked it's way out. I'd be more willing to bet that the operator either forgot to put the pin in to begin with, or somebody else pulled it out while the were stopped someplace. But I'm leaning more to the theory of they just forgot to put it in.