I did a similar trip in 2024 in my G82, leaving from Maryland, and went to Vancouver, after going to Banff.
Can't wait to hear more about your trip.
And the Beartooth Pass, yes, indeed was amazing. Here is me in Red Lodge, MT having lunch at the Prerogative Kitchen, the town after coming out of the Pass.
And I went through St. Louis coming and going, as I have 2 goddaughters there, so it was like my Midwest hub.