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 in which the body of the vehicle, its floor plan , and chassis form a single structure, 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 of the vehicle, its floor pan , and chassis form a single structure, while the skin adds relatively little strength or stiffness.Allan, Rob.