In the Caravan World August 2000 edition on page 107 it tells you all about the Queensland RTA and safe towing etc etc the man to contact is:- 

Neville Franklin

Project Officer

Land Transport and Safety Division

Queensland Department of Transport

[07] 3253 4778

 

Nice chap to talk to and he will send you everything about caravans. It's basically the agreed national standards

 

Cheers for now
 

Neil and Bev Louer