Persons with an Ontario Class DZ licence are licenced to drive vehicles such as straight truck, dump truck, cement truck, garbage truck and rescue & fire trucks - with airbrakes. A Class D licence is required to operate a vehicle over 11,000kg with a towed trailer not over 4600kg. Should your towed trailer exceed 4600kg, you will need to upgrade to a Class A licence.
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An AZ license allows you to drive tractor-trailers and other large commercial vehicles, while a DZ license only permits you to drive straight trucks or other commercial vehicles with a gross vehicle weight rating over 11,000 kilograms. In essence, an AZ license covers a broader range of vehicles compared to a DZ license.