Let me start this off by saying this isn't humor, this isn't a joke, and i'm extremely lucky lots of people weren't hurt or worse today.
Earlier this afternoon, I was delivering some furniture for my mother on a 12' flatbed trailer. I hooked everything up to my tacoma, checked lights, straps, chains, the whole nine yards. I pulled the load successfully about half an hour to the house where the furniture was going, helped unload it, and then started back. When I was about 10 minutes from my house, the now unloaded and extremely light trailer began to sway behind me. I have towed small trailers before, so as before, I eased into the gas to attempt to straighten the trailer. Doing so did not help, and the trailer continued bucking behind me. (I was driving on a 4 lane highway with a central turn lane.) As I realized that my tactic was not going to work, I let off both pedals and eased into the middle lane, hoping to slow it down by it pressing against my truck and hopefully not damaging anything. Before I could react to it, the trailer bucked itself off of my hitch and slid to my left, across 3 lanes of traffic, before jumping the curb and safely coming to rest off the road and out of traffic. the trailer was pretty banged up, and the hitch was not usable. My dad and I later chained it up to his silverado and (very slowly) made it back to the house. When I looked back on the situation, I realized that I had made a mistake that had very nearly cost me and others. I had forgotten to put a holding pin in the latch that holds the trailer to the ball, and when the trailer began bucking, it simply removed itself from my hitch, and the chains holding it on were able to bounce off. I made mistakes today, this much is true. I am, however, fortunate that the only harm done was to the trailer.
The moral of the story is that even a light trailer can be trouble, and ALWAYS ALWAYS ALWAYS make sure that the connection between your truck and trailer is locked, pinned, and securely chained.