Check out page 109 of the published housing policy, makes it pretty clear to me that Tiny Houses on wheels are caravans and are managed by the Local Laws and not the Building Code.

”Given these variables, there is currently no standard definition in the Victorian Planning System for tiny houses, but rather Yarra Ranges Council defines and regulates them on a case-by-case basis. For example, if a tiny house is on wheels and moveable, in many cases it is considered a caravan, which is not generally regulated by the Yarra Ranges Planning Scheme but rather is subject to Council's Neighbourhood Amenity Local Law 12.3 (Caravans).”

https://www.yarraranges.vic.gov.au/files/assets/public/v/3/webdocuments/council/policies-strategies/housing-strategy/adopted-housing-strategy-2024.pdf