Phone your local police department, which will check whether the trailer contains any components of suspicious origin (such as stolen or modified parts).

You must be able to show the origin of your trailer's components and prove that you own them by such means as providing invoices.

The police department will issue you the Vérification des pièces d'identification d'un véhicule form and affix stickers to the trailer.

You will need these documents in order to apply for a vehicle identification number plate.