MOTOR VEHICLES (STANDARDS) REGULATIONS - AUSTRALIAN VEHICLE STANDARDS RULES
157General coupling requirements
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157 General coupling requirements (1) A fifth wheel coupling, the mating parts of a coupling, a kingpin or a towbar must not be used for a load more than the manufacturer’s load rating. (2) A kingpin must be used only with a fifth wheel coupling that has a corresponding jaw size. An adaptor must not to be used to fit a kingpin to a fifth wheel coupling. (3) The mating parts of a coupling used to connect a semi-trailer to a towing vehicle must not allow the semi-trailer to roll to an extent that makes the towing vehicle unstable.