YOU should check it yourself if you are modifying the vehicle. ;) The rules are not consistent across the country, there is a lot of misinterpretation of the rules, the is a lot of inorrect information that gets passed around and you are responsible for the compliance of your modifications. Check absolutely everything yourself in relation to modifications and rules. I believe in the past there were even Engineer signatories that have approved beyond their scope based on the information that I have been able to find.
https://www.vicroads.vic.gov.au/regi...al-certificate
Pg7

