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I haven't traveled a lot in Canada, so I can't give you locations on camp grounds. Do, however, pay attention to your gas gauge. If you stay in Canada, fuel stops between Thunder Bay and Sarnia are spaced quite far apart. They are there but be careful not to pass by any without checking your fuel gauge.
The Good Sam RV Travel & Savings Guide is a directory of more than 15,000 public and private campgrounds in the U.S., Canada, and Mexico. The ones in Canada are arranged by province and cities within each province. It's also easy in places to drop down into the U.S. so having the directory might be useful. Also make sure you have a good GPS. We found that a good navigation system was essential because it's easy to miss turns in remote areas and finding a good place to "go around the block" isn't always obvious.