I found this reference under "Recreational Vehicles "
"Towing More Than One Vehicle
Cars, passenger vans and SUVs are not permitted to tow more than one trailer or one vehicle. Motor homes, trucks, pickup trucks and truck campers are legally permitted to tow two trailers or a trailer and a motor vehicle behind a trailer. However, a three vehicle combination that is swaying excessively, is unstable or has reduced handling capabilities is subject to action by the police as an unsafe combination of vehicles under the Highway Traffic Act.
The maximum length of any combination of vehicles is 23 m (75' 6")."
and this under "Pulling a Trailer Safely"
"It is against the law to tow more than one trailer behind your vehicle unless using a commercial vehicle. You cannot carry people in a house or boat trailer. "
any advise or clarification of this would be greatly appreciated.
Both quotes are correct and not conflicting , my pick up truck is considered a commercial vehicle (black plate) for the purpose of this regulation.
Hope this helps others.