tow bar is affixed to the tow vehicle. The tow bar provides the
link between the vehicle and the caravan, trailer or camper trailer.
There are lightweight and heavy duty tow bars. The tow bar
should clearly identify its maximum towing weight rating,
its maximum ball mass
and the manufacturer’s name, trade mark and
What is the Australian Standard for a
tow ball ?
The Australian Standard
for tow balls for weights up to 3,500 kg is 50 mm and
the rating must be stamped on the ball. Always check this
to verify the towing weight capacity of the ball. The rate
can be between 750 kg and 3,500 kg.
The diameter of the tow ball shank should be 22.2mm.
The tow ball shank slides into a hole in the
ball mount or tongue and is affixed with a locking washer
and a nut.
Ball couplings on towbars are required to be
installed so that the height of the centre of the body of
the ball coupling is between 350mm and 420mm from the ground
when laden (Refer to ADR 62/01).