Just back from our trip, Wonderful! I appreciate all the help! We did the NPS shuttle all the way around the Going to the Sun Road. Took hikes from several stops. We stayed at North American RV Park outside the West entrance. Not bad, a little crowded but we weren't there much. Full hookups. Looked through Apgar, it would have been tight and seemed like a lot of people waiting for the bigger spots. Would love to stay there, but traded for the security of a reserved spot. We were in the park more than the campground. Only advice I would add is to bring snacks/food and water along. Not much food is avaialble on the GTSR. Thank you all!