will commercial drivers need a passport when driving between Canada and the US?

Answer 1

If you have a fast card no you will not. If you dont then within the next couple of years you will.
If you cross the border often you may want to invest in a Fast Pass but make sure your record is really clear.
Contact your local Dept of Motor vehicles for more information

Answer 2

If u r a Canadian citizen u have to show ur Passport if u r Immigrant u need a visa, which can be obtained on provison of letter from ur employer, if self employed ur bank statement and contract with US company