You don't need an air brake endorsement for a non air brake truck.
Quote:
In Alberta, you are not required to hold an air brake endorsement if
operating a single motor vehicle registered as a farm vehicle. However, you
do need an air brake endorsement if driving a farm vehicle combination
that requires the driver to hold a Class 1 operator’s licence. When applying
for a Class 1 operator’s licence, you will need to show proof of your air
brake qualifications, even if the vehicle you will be driving is registered as a
farm vehicle.
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I looked for the GVWR requirements for air brakes but couldn't find.
My thinking is that there are not many tandem trucks without air.
I would recommend just getting it.