I haul my horses ( well the minis) loose in the trailer. About 5 years ago, I bought a Ponderosa gooseneck trailer, new, and hadnt had it a month, and had a mare and colt in the front compartment, and was driving through town, after a vet trip, and the whole rear door fell off. the hinges on that trailer both sat the same direction, and for some reason, when crossing a fairly rough ( not so rough that I thought about it though) track, the whole rear door fell off. Imagine my suprise when I heard that clank. My worst fears had just happened.
I was so lucky, the horses did not come off, but what if. There were several people walking down the sidewalk who came to my assistance. But the mare and colt remained on the trailer. Bet they were truly scared to death, or else had no idea why I slammed on my brakes.
Now I traded that trailer IMMEDIATELY that very day, for a aluminum trailer that had doors hinged in a up and down position so that I didnt have to worry about that ever happening again.
IT was a costly thing, I lost big time on the steel trailer, and the dealer knew whatever trade in he gave me, I would take., but I dont think I could have ever driven it safely again. I now tell everyone to check their hinges, and if they are put on that way, to go get a piece welded onto them, to cause a door not to be able to ride up.