Which of the following is not an acceptable method of containing loose parts when securing flattened or crushed vehicles?

Containing Loose Parts Use a containment system that: Prevents loose parts from falling from all four sides of the vehicle AND Extends to the full height of the cargo. The containment system can consist of one or a combination of the following methods. Structural walls. Sides or sideboards. Suitable covering material. The use of synthetic material for containment of loose parts is permitted.