I know that some (if not all) Provinces require a special license for >26,000 pounds and/or air brakes for their citizens.
The issue for us Americans driving in Canada is does Canada grant reciprocity for our issuing state's license?
In other words, our official residence is Florida which does not require any sort of special license to drive whatever you can afford in an RV regardless of its weight, length, or braking system. So the question would be does Canada grant reciprocity for us to legally operate our coach in Canada. I suspect yes as is the rule of law in the U.S. (on federal highways.)
Hopefully a friend from north of the border will enlighten us!