National Transport Commission (Road Transport Legislation – Vehicle Standards) Regulations 2006
71Trailer drawbar length
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71 Trailer drawbar length
(1) The distance between the coupling pivot point on the drawbar of a dog trailer, and the centre line of the front axle group or of the front single axle of the trailer, must: (a) not be over 5 metres; and (b) not be under 3 metres, if the trailer is used in a road train over 19 metres long.
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Length of a drawbar on a dog trailer
(2) The distance between the coupling pivot point on a drawbar, and the centre line of the axle group or single axle on a trailer with only 1 axle group or single axle (except a semi‑trailer) must not be over 8.5 metres.