RV smoke alarms advice

I noticed in the latest Caravan World mag a small article on the smoke alarm requirement in NSW – does this apply to ALL vans travelling THRU the state or just to vans registered in that state.

I am picking up a new one from Vic in 2 weeks and need to know if I have to buy and install one bfore I tow it back to QLD thru NSW, as I am sure this is not a standard manufacturer installation.

Michael Kelly