Probably people forgetting to engage the side locks before towing.
I could see that. But I dont think mine would fall down even if I forgot the two latches. Mine is pretty stiff going up and down but then again it is pretty amazing to see what is moved around the TT after a long tow.
2013 Rockwood Mini Lite 2306 w/Murphy Bed
2004 F-150 4.6 Liter 4x2 Factory Tow Package
2012 - 21 Nights Camped
2013 - 21 Nights Camped