I don't think you'll have any problems in Quebec. I'm certain it's the "RV Boondocking" capital of Canada.
I think the word "boondock" is actually from the French for "frugalle".
As far as Ontario, I'm really not sure. You can probably stay at any of the highway gas station/restaurants
(Esso, etc.) places right on the highways. To tell you honestly I'm not sure, but I think they'd rather have
you rest and drive, than try to drive tired. Most of the Walmarts in this province aren't always near the major
highways, so they can be a little harder to find. There's also Rona/Home Depot/Real Canadian Superstores, etc....
We also have a smattering of truck stops (5th Wheel, Husky, T/A, Flying J) or two along the 401 that don't mind
an overnighter.
If you're coming via the Niagara Region, you're welcome here too.
PM me for details.