Looking at the picture again I feel there was either a driver following to close an not paying attention or was going to fast to stop ...
I have has a 5th wheel hitch fail on me in a semi, I had two 30,000pd steel coils on an was about to pull into a driveway, the jaws came loose an as luck would have it the trailer dropped on the truck frame not hurting the landing gear ... I jacked the trailer back up an pulled the truck out from under the trailer, they sent another truck to pull the trailer into the factory so I could deliver the load... Mu thoughts were that I had just 10 minutes before been traveling down I-75 at 60mph in traffic Ugh !!! so locking jaws on 5th wheel hitches will brake, trust me I have been there ...
Safe Travels
