We too are going to Glacier and Yellowstone this summer in our 2013 Tiffin Allegro RED... We have reservations in Yellowstone (9/6-9/9) but want to stay longer and to go to Glacier either before or after...
We were looking at the west side of the park, Big Creek Campground, but really don't know the area.
Why did you choose St. Mary? Would like to tap in to what you have learned so far...
Thanks!
Lseleen