Agreed - almost zero. To my knowledge the only chargers in Eastern Canada are at the Sheraton hotels in Montreal and Toronto. Aside from certain people's garages, of course.
Ontario is supposed to be installing chargers at the GO Transit (train) stations around Toronto. I don't think any of them are actually in place yet. And of course unless you are commuting into Toronto they probably won't be that useful.
RV parks are pretty much it. The KOA campgrounds have a policy of $10 for an EV charge. Be sure to call ahead and reserve your slot. Best to avoid the weekend if you can (including Friday night); those are the busy times.