Just have someone get hurt or killed from a trailer containing hazmat, not placarded, especially a fireman, or other emergency response person.The lawyers will have a field day with it. Look at what happens now if you get into a car accident. No fault of yours. The lawyers still put you 30 percent at fault just for being there. Guaranteed the widow of someone hurt or killed will have a lawyer all over it.However if a trailer is backed up to a dock it is considered a extension of the dock therefore by law the trailer does not need to be placarded; it is only when the trailer is pulled from the dock door at which point the trailer must be placarded. Companies want the trailers to be placarded during loading process which makes sense, but if a fire occurs when trailer is backed up to a cross dock the company would not be liable for no placards on trailer because the trailer is considered a extension of the dock.