Question Cargo inside a trailer: Answers Does not need to be secured. Should be stacked no taller than three feet high. Should be secured to prevent movement in transit. Should be loaded with the heaviest items on top of lighter items. Explanation Cargo must be properly secured to prevent it from moving in transit. Loose cargo can be dangerous to the driver operating the CMV, as well as to other road users. Take a FREE Practice Test Now This questions appears in the following tests: New Jersey Knowledge Test Class B ,