Semi-trailer collapses spontaneously during turn - GIF

[Frank S]

Utility brand dry box trailers are noted for being one of the lightest constructed box trailer on the road. Without seeing an accident report I can tell you that the load inside had at least 1 heavy pallet stacked on top of another and if it had been secured at all often box drivers do not even look inside of their trailers when they are ;loaded, the load locks when used only extend from side to side and there sometimes are no vertical E tracks for strapping to.
The impact of a 2500 lb pallet falling from 3 feet high un a turn could have been enough to cause the trailer to collapse especially if the trailer was loaded heavy in the first place.
Remember these trailers have no frame only a short sub frame where the axles are All of the structural strength in them is from the thin siding and the even thinner roof the only other structure in these trailers is the extruded runner that joins the roof and the side walls