You might look at Glacier Meadow RV Park Our Home | Glacier Meadow RV Park and Campground
I spent a week here this summer. Water & Electric with free pump out 3 times a week. Quite, clean, away from city lights so unbelievable stars. If you do make Glacier Hidden Lake is a must see, http://www.hikinginglacier.com/hidden-lake-overlook.htm
1.5 mile one way hike, Saw mountain goats, lots of ground kidders, and luckily saw a Grisly walking toward the road and got a couple great pictures as it stood on it's hind legs and scented.
DW just reminded me there is no electronic service at the camp, no cells, internet, or TV. They have a cell "hot spot" but you'll need your DVD's and some good books.