Australian Design Rules (ADR's) summary posted on the Vicroads web site. This provides a listing of which ADR's apply to your vehicle in relatiion to it's build date.
www.vicroads/registration/vehicle standards

VSB6 Heavy Vehicle Modifications. This is a Commonwealth Government web site and covers Australian Design Rules which became a Commonwealth responsibility after 1989. This bulletin covers all aspects of alterations to your truck. Includes the standards for fitting of bodiies, cranes, turntables, additional seats and so on.
www.infrustructure.gov.au/roads/vehicle_regulations/bulletin/index.aspx

Click on this link to access a list of VSIs on the RTA site. RTA VSI list

We recommend the following in particular:

• VSI No 12 - Lights & Signalling Devices. Post July 1975, and pre and post 1991 rules for lights
• VSI No13 - Rear Marking Plates. If you have plates fitted to your oldie they must comply with these standards. Temporary fitment while your truck is on busy or fast roads is recommended
• VSI No 23 - Fifth Wheel Mountings. Don't put a turntable on your prime mover without seeing this first. U bolts are NOT acceptable.
• VSI No 41 - Guidelines for A-Frame towing (Nov 2007)

Click on this link to access a list of VIBs on the RTA site. RTA VIB list

We recommend the following in particular:

• VIB No 14 - test procedures for air (and vacuum) brake systems. This is an easy to read bulletin which can be used for checking your system at any time.
• VIB No 46 - Failure of Semi Trailer Skid Plates due to Corrosion. A must see for all those with old trailers
• VIB No 57 - Brake tests for heavy vehicles. Policy for brake testing at less than 30 km/hr