June 1 to Labor Day, reservations will get you closer to where you want to be, wherever that might be.
Many of the typical (Walmart, etc.) free overnight stops have been eliminated due to regular abuse over time.
There are few roadside rest areas, or truck stops along our freeways, like on your Eisenhower Interstate system.
We have some National Parks that can be explored online at the Parks Canada website, and there will also be Provincial Parks in some areas, that can be explored online at the various provincial websites under tourism.
You can also use google to find "public private commercial RV Parks and Campgrounds near ?????????" and that usually pulls up a list of more than a few, if you're just looking for accommodations.