Just curious -- where would you require the use of chains? The WA/OR coast? Utah?If it was me I would avoid going to BC coast entirely (unless you have to) -- drive through Cranbrook/Spokane/Seattle to get to the Coast as opposed to going through the Rockies (the mountain passes aren't nearly as bad IMO). Gas is cheaper too.
Also, I wouldn't spend a lot of time in the big cities like SF and LA -- it's easy to fly back there if you want to visit again. Consider maximize your time in more remote places that will only be accessible via car because you'll only be able to do those again if you do another road trip.
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