WHAT IS IT
In Ontario, a trailer requires an annual safety inspection and certificate if you tow something that is more than 4,500 kg. This is done to ensure that the trailer can operate safely. The inspection is typically done at a Ministry of Transportation Ontario (MTO) Motor Vehicle Inspection Station. Trailers receive a Yellow Safety Inspection Sticker when the inspection is passed, and this sticker must be affixed to the vehicle.
WHEN DO YOU HAVE TO DO IT
A commercial trailer that hauls more than 4,500 kg requires a safety inspection every 12 months.
If your trailer is for personal, not commercial, use and is going to be used to tow something like a boat, for example, along public roads in Ontario, it must be registered with MTO, and a one-time registration fee will be required. Trailers for personal use are exempt from annual inspections in Ontario.