Code of Practice for Light Trailers NZ STANDARDS NZS5467:1993
Section 8.1, Page 12
Every Trailer shall have a safety connection(s).
Section 8.2, Page 13
Safety connection (s) shall have a minimum breaking strength equal to two times the trailer Maximum Towing Mass.
Section 8.7, Page 13
Safety connections shall be indelibly marked by the component manufacturer with their rating. The rating shall enable the minimum breaking load of the component to be identified.