Question Items on a flatbed: Answers Are usually heavy enough to not need to be strapped down. Should not be strapped down if you are driving more slowly than 35 mph. Must always be secured. Explanation On flatbed trailers and trailers without sides, cargo must be tied down to prevent it from shifting or falling off in transit. This questions appears in the following tests: Hawaii Class A Knowledge Test Kentucky Class A Knowledge Test Kentucky Class B Knowledge Test Louisiana Class A Knowledge Test Louisiana Class B Knowledge Test Minnesota Class B Knowledge Test Missouri Class B Knowledge Test New Mexico Class B Knowledge Test Rhode Island Class B Knowledge Test