We recently went on a road trip from the Bay Area to Banff and back in our 3 and had a blast. Loved the experience and would do it again. Here are some charging details that may help those planning a similar trip.
Day 1: Started in South Bay and drove up I5 on day 1. Charged at Corning, Mt. Shasta and Grants pass, OR superchargers. Spent 10-11 hours on the road including charging stops. Stayed overnight in Albany, OR
Day 2: Spend early part of the day in Portland, and resumed driving post lunch. Drove to Chilliwack just north of the border. Stopped at Springfield, OR, Centralia, WA and Burlington, WA. Centralia has the best Supercharger - they have a couple of windshield cleaning squeegees and two buckets with water. Just like gas stations!
Day 3: Drove from Chilliwack to Banff along TC-1, stopping at Merritt and Revelstoke superchargers. This is perhaps the most scenic long drive I have been on. And living in CA and having previously driven cross country through Yellowstone etc, the bar was already pretty high. Ended up staying at the Banff Park Lodge which has one L2 charger (charging at ~60km/hr which was great for overnight charging)
Days 4-7: Spent time within Banff and parts of Jasper National Park while charging overnight without any range issues. Didn't go to the town of Jasper, but if you do, you may need to charge overnight at one of the two destination chargers. Jasper library also shows a free charger, but not sure if it's available all the time. Would love to hear if someone has experience charging in Jasper.