Dave Prince of Brisbane has put together a list of the Australian Army's CMP types census codes
here .These census codes are not to be confused with WD census numbers, but are the code number for that vehicle/body combination. They were applied not just to CMP's, but also to any other vehicle and sometimes trailers (CMP's, Jeeps, GMC's, Studebakers, Land Rovers, Inter ACCO's , etc)
These codes may be unique to the Australian Army, or perhaps there is a commonality with the Canadian codes?