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https://www.transportation.alberta.ca/2182.htm

Here are some other things to remember when towing a trailer:

A trailer must be registered and licensed before it can be used on the road.
If driving on multi-lane highways, remember that slower-moving vehicles should stay in the right-hand lane.
Plan your driving. Avoid situations that may require quick lane changes or unexpected stops.
If traffic builds up behind you, find a safe place to move over and let others pass.
Your trailer must have working taillights, brake lights and turn signals that are activated from the towing vehicle.
If you have a ball-and-socket hitch, you will also need safety chains as a secondary means of attachment. Chains should be crossed under the tongue of the trailer and correctly fastened. This applies to all trailers except fifth-wheel trailers.
If your trailer is equipped with a breakaway emergency supplemental braking system, make sure that the system is properly connected according to the manufacturer's instructions.
Adjust vehicle mirrors to clearly see traffic approaching from behind. You must use extension mirrors if the trailer is wider than the towing vehicle.