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If you are having trouble accessing the Ontario Department of MV for information, try Google. I typed in "Commercial driving licence in Ontario" and found several sites which will give you some information about the requirements, procedures, etc. for obtaining the proper licence in this province.
Again, for accurate information, I would recommend a visit to the government regulatory office responsible for motor vehicle licencing - including trailers and RV's. Only they can provide you with the proper and correct legal licencing requirements in Ontario. Rules and regulations that apply in various US states and other Canadian provinces may be different from those in Ontario.