as for me i currently hold a AZ licence and am a Truck Driver/ heavy equipment operator trainer at Transport Training Centres of Canada.
I also teach airbrake endorsement courses
I just finished training Durham Regional Police forensics unit recently as they require a DZ licence for there new Mobile Command Unit (its quite the Unit!)
I have also trained several MTO Motor Carrier Enforcement officers obtaining there AZ licence.
so if anyone has any question regarding trucks, truck safety etc,,,feel free Ill try to help.
Above is merely a suggestion/thought and in no way constitutes legal advice or views of my employer. www.OHTA.ca