VA Rebel - Both sides of the Glacier National Park are beautiful. We have stayed in East Glacier, Many Glacier, Waterton, and Lake Macdonald. All wonderful. The most spectacular mountain spot in the USA to me is Many Glacier. The campground there is OK for all size rigs. From there you can take the boat and hike up to see Grinnell Glacier (hope I got spelling right). Just the play of light on the lakes and surrounding mountains is worth the trip. Go to the lodge and sit around the open fireplaces. Watch the sunset.
A bit north is Waterton Park. The RV park there takes rigs of all size. The view from the close by Prince of Wales lodge is breath taking. I recommend afternoon high tea at the lodge, but teen agers will moan.
We have also stayed on the east side a couple of times.