NEW!
The province of Ontario announced a new rule effecting RVer's, Effective June 16, 2008.
To view PDF files, you will require Adobe Acrobat Reader.
Your Pickup, if it has Commercial Plates [Black letters with white] may need to have your licence upgraded
See link: http://www.mto.gov.on.ca/english/trucks/regulations/trailers.htm
Re cap
"Any tractor-trailer [ That includes an 5th Wheel or Travel Trailer ] or combination of motor vehicle and towed vehicles where the towed vehicles [Trailer 5th wheel ] exceeds a total gross weight of 4,600 kilograms" or 10,141 pounds
Links: http://www.camping-canada.com/towing_regulations_e.htm