We took our first big trip to Glacier from Salem OR two yrs ago. Went thru Coeur d'alene and up thru Sandpoint on US 2 thru Kalispell and Bonners Ferry. Stayed at Mountain Meadows RV in Hungry Horse www.mmrvpark.com
. . It was very nice RV park with a lot of trees. It is more hilly than some places but spots also more private. There is also a KoA near there flat and less shade but easier parking. Prefer Mountain Meadow for shade.
Parked car at visitor center and took an all day red bus tour. Also drove over the pass and took a loop in our truck. The red bus tour allowed my husband to enjoy the tour.
Went on to Yellowstone and stayed in great RV place north of Gardner right on Yellowstone river (yellow stones edge RV park. Used the next morning to drive into Yellowstone and get in line early to secure site at Mammoth in the park. No reservations there so you want to be there by 9 or so to get site as others leave.