Modify a light trailer or caravan

Modifications to a light trailer or caravan must not affect its compliance to the to the standards for registration.

Modified light trailers and caravans with an ‘Aggregate Trailer Mass’ (ATM) not exceeding 4.5 tonne must meet the design and construction standards and technical requirements detailed in Vehicle Standards Bulletin 1 (VSB1). Trailers and caravans modified to meet the requirements VSB1 are accepted as meeting the standards for registration.

For light trailers, Vehicle Standards Bulletin 1 Version 5 (External link) will apply up to 30 June 2023.

From 1 July 2023, all trailers must comply with Vehicle Standards Bulletin 1 Version 6 (External link)

If you are unsure the modifications you are planning for a light trailer will affect its compliance to VSB1 you should consult with a VASS Signatory and obtain an approval letter confirming the compliance of the modifications.

Complying with VSB1

The entire chassis or any part of a chassis with its vehicle identifier recorded on an interstate Written Off Vehicles Register as a statutory write-off cannot be used to build or repair a trailer.  A trailer chassis can be constructed of second-hand parts/components provided they are not sourced from a statutory write-off vehicle.

Second-hand parts or accessories may be used to construct a trailer body.  The design and construction standards and technical requirements detailed in VSB1 must be adhered to. 

Changes to light trailer or caravan aggregate trailer mass (ATM)

If you wish to change the aggregate trailer mass (ATM) from that which was originally specified by the trailer manufacturer, the following is required:

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