__________ are specialized cribbing assemblies made of wood or plastic/composite blocks or collapsible metal in a step configuration.

Step chocks are specifically designed cribbing assemblies that are uniquely configured to provide stability and support during vehicle rescue operations. Their stepped design allows them to fit securely under vehicles or structures, ensuring that they can effectively prevent movement and offer a safe working environment for responders.

Using materials such as wood or plastic/composite blocks, or collapsible metal, these step chocks are intentionally crafted to provide maximum strength and durability while being lightweight enough for ease of handling. This design is vital in rescue situations where conventional cribbing may not offer the same level of support or fit into tighter spaces, making step chocks a preferred choice for personnel trained in vehicle rescue.

In contrast, braces, platforms, and supports are broader terms that encompass various types of stabilizing equipment but do not specifically refer to the step configuration and assembly characteristics that define step chocks.