This part of ISO 21308 provides a set of codes for the exchange of dimensional data between truck chassis manufacturers and bodywork manufacturers. It applies to commercial vehicles as defined in ISO 3833, having a maximum gross vehicle mass above 3 500 kg. The process of exchanging the above information can involve: ? chassis manufacturer; ? chassis importer; ? chassis dealer; ? one or more bodywork manufacturers; ? bodywork component suppliers, e.g. manufacturers of demountable bodies, cranes and loading equipment, tipping equipment.