Before revision: Commercial car bodies are almost never true monocoques but instead use the unibody system (also referred to as unitary construction, unitary body–chassis or body–frame integral construction),NAAA Structural Damage Policy dated 1 January 2011, retrieved 29 March 2012 which uses box sections, bulkheads and tubes to provide most of the strength of the vehicle , while the skin adds relatively little strength or stiffness.Allan, Rob.
After revision: Commercial car bodies are almost never true monocoques but instead use the unibody system (also referred to as unitary construction, unitary body–chassis or body–frame integral construction),NAAA Structural Damage Policy dated 1 January 2011, retrieved 29 March 2012 in which the body, its floor plan, and chassis form a single structure of the vehicle , while the skin adds relatively little strength or stiffness.Allan, Rob.