Thank you for your email inquiry to the Department of Transport and Main Roads regards mounting diesel filled jerry cans to the rear of a vehicle.

The fitting and use of vehicle accessories does not require specific approval from the Department of Transport and Main Roads (the department). As such, the department does not approve or disapprove of vehicle accessories and no written authority is necessary to enable you to proceed with the fitting of accessory assemblies to motor vehicles.

However, further consideration should be given to the following;

1- Allowable load projection, rear overhang.
2- A clear view of the vehicles rear lights, at least 20m from the rear, at a 45 degree angle, with in 360 degree arc (brake, stop, blinkers number plate light/number plate and reflectors).
3- The jerry can holder should be manufactured to engineering standards, Australia.
4- No vehicle must be fitted with any object and or fitting that is not technical essential to the vehicle which protrudes from the vehicle and is likely to increase the bodily injury to any person.
5-The rear axle load rating and tow bar downward load rating, must not exceed specifications as stated by manufacture of both the vehicle and towbar manufacturer.
I trust this answers your enquiry.