I've done a bit more research this afternoon and it's definitely going to be much more cost effective for us to rent an RV on the Canadian side.
Have had a bit of a better look at the 'loop' we could probably do Banff to Yellowstone/Grand Teton loop (flying in and out of calgary), coming down the Montana side and back up the Idaho side, and skipping the big hauls back over the coast. To me this seems like a much more manageable route. If we decide to go to Seattle and/or Portland, we can just fly there rather than try to manage big cities with an RV.
