Not all that much I can add to the above with a couple of exceptions.
1 - In Alberta through the oil belt a great many of the hotels/motels are booked up by companys far in advance. they do not give up the rooms if their people don't show as they are afraid they may not get them back. As was mentioned not all that bad if you have your camping gear.
2 - National parks out this way tend to get booked solid for long weekends and holidays. This includes hotels/motels/hostels/b&b as well as campgrounds.
3 - I see 2 sources you haven't mentioned in your list. Those being B&B accomadation which can be a great deal and are ussualy listed on line and also the HU communities you plan to pass through may be up for a  or have a yard for camping and a shower.
Anyway it sounds like you have a great trip planned.
Rick
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