Question Blocking is used to: Answers Keep cargo in a large box. Prevent cargo from sliding in a trailer. Prevent cargo from falling out of a trailer. Explanation Blocking may be used on all sides of a piece of cargo to keep it from sliding while the vehicle is in motion. Take a FREE Practice Test Now This questions appears in the following tests: Delaware Knowledge Test Class A , New Mexico Knowledge Test Class A , Florida Knowledge Test Class B , Virginia Knowledge Test Class B , Washington Knowledge Test Class B ,