Glacier is beautiful....as is the surrounding area. Prepare for rain. If you like to hike, bring Bear Spray and Bells to make noise. You need to see "Trick Falls".
Also, bring passport and go to Waterton National Park in Alberta, Canada. Beautiful National Park on the Canadian side of Glacier National Park.
The Flathead Lake area just Southwest of Glacier is beautiful, and we like to visit the little town of Big Fork, Montana.
5th wheel cannot go on the "Going to the Sun Road". Snow on top of the road is not uncommon during the summer.