Question Cargo on flatbed trailers should be: Answers Tied down. Glued down. Left loose. Pushed to one side. Explanation Cargo on flatbed trailers or trailers without sides must be tied down to prevent it from shifting or falling in transit. This questions appears in the following tests: Colorado Class B Knowledge Test Connecticut Class A Knowledge Test Illinois Class A Knowledge Test Indiana Class A Knowledge Test Kansas Class A Knowledge Test Nevada Class B Knowledge Test North Dakota Class B Knowledge Test Oregon Class B Knowledge Test Tennessee Bus