If you are spending a reasonable amount of time in nth america (over 3 mths say) not buying a car for the 'savings' is a bit of a false economy. Whilst if you had the cash kitting out a van would be sweet, you can get a cheap half decent sedan and register it easy enough in canada and the flexibility and savings in travel costs will pay for themselves.
We bought a sedan on vanc island for 800 bucks climbed all over canada and down through rockies, california and into mexico cragging all the way. Finished off with a month or two driving all over mexico (not climbig in mexico). When we flew out we just gave the car to some mexican friends who drove us to the airport.
For the shared cost of the car what did we miss out on? A few more weeks dirtbagging at the same crag bumming lifts to the supermarket and sitting in a tent in the rain. Make your own choice but I know what I'd prefer.