The United States, Mexico, and Canada have reciprocity agreements with each other so you can drive a truck in any of those countries with your CDL.In Ontario, Class 1 is equivalent to Class A while Class 3 is equivalent to Class D. If you do not want to tow a trailer and drive the vehicle by itself, then you only need a Class 3.
In Canada, you must have a Class 1 to drive tractor-trailers and any Class 3 truck.If you do not want to tow a trailer and drive the vehicle by itself, then you only need a CDL Class B. In the United States, you must have a CDL Class A to drive tractor-trailers and any Class B truck.Many state DMV websites also have digital copies available online. Visit your nearest DMV office and ask for a copy of the state commercial driver's manual.