You state that the requirements are completely lumped on the suspension kit manufacturer. Do you not trust said manufacturer to provide you with a legal kit?
The bulk of people would be buying a well known commercial 50mm suspension kit, along with fitting up to a 50mm larger diameter tyre as per the regulations. It's self certification and this is what the legislation is asking you to do, What's the issue with doing it?
The rest of the owners would be doing modifications outside of the rulings in question and are therefore going through Engineering.
Is the above not clear to you?
or are you just after feedback on the current legislation rather than how it might work for the consumer who is trying to self certify their modification and conform to the rules?
Ok, now I understand a bit more of where you're going with your questioning. A lot of this is still new to me and I don't know all the jargon yet.
So, when you say 'self assessed' you're just saying that the person is making sure that it fits the VSB-14 13.3.1 requirements that it is: a commercial kit, provided by a corporation, and is fitted in accordance with the manufacturer's instructions (paraphrasing). Is that what you're saying is meant by the wording "when assessed at" in the wording of Option 1 in the following paragraph:
"
specifically designed and tested by the suspension lift kit manufacturer for the make/model/variant of the vehicle being modified to ensure no
adverse effect on the modified vehicle’s propensity for rollover, handling characteristics, braking performance and structural integrity
when assessed at the combined suspension lift (up to 50mm) and tyre radius increase (up to 25mm), i.e. a total increase in ride height of up to 75mm
"
To me when I read the quote above, it is ambiguous whether it means "self assessed" or " manufacturer assessed". VicRoads takes the position that it means manufacturer assessed. That's what their engineers say. My VASS engineer currently thinks the same. But, if there is evidence to the contrary we're happy to hear it!
(To answer your question, it is just really what this wording means to people who might have come across this before. I can relate my reading of it, and ask the forum how other people read it, because it comes down to this point whether the '50mm sus/50mm tyre dia mod' is to the letter of the law legal or not).