Cargo on flatbed trailers should be: Before you start the test, please answer the question below regarding your insurance status. Without insurance you will not be able to drive in Ohio Do you currently have car insurance? Yes I have insurance. Great, you're all set! Click here if you still want to compare rates. No, I need insurance and I want to compare options. Question Cargo on flatbed trailers should be: Answers Tied down. Glued down. Left loose. Pushed to one side. Explanation On flatbed trailers or trailers without sides, cargo must be tied down to keep it from shifting or falling off in transit. This questions appears in the following tests: District Of Columbia Class B Knowledge Test Indiana Class B Knowledge Test Massachusetts Class A Knowledge Test Oregon Class A Knowledge Test