Hey Andrew.
Thanks for the tip. Our trip takes us from Whitehorse down to Pr. Rupert BC where we'll take a ferry to the northern tip of Vancouver Island to tour for a week, then to Vancouver to visit family. From there down the pacific coast from Pt Townsend WA to San Diego, zigzagging across the central / southern states to Key West, then up the east coast to the Maritimes and back across Canada.
So far our daughter is a great traveller but we don't know what to expect on such a long trip. We have the luxury of being able to take our time so I'm sure it will be great.