We love Glacier Meadow RV Park in Essex MT. It's between the east and west entrances to Glacier. Reasonable rates, long level pull thrus. Water and electric with pump service for tanks 2x a week. Don't miss Izaak Walton Inn in Essex. Go up east side of Going to Sun one day and the west side another day. Stop along the way and enjoy the views.
We went into Canada in the RV, stayed 10 days then returned to the US.
check www.rvparkreviews.com for Tunnel Mountain campgrounds in Banff. We stayed at Mount Kidd RV Park in Kananaskis AB and drove to Banff and Lake Louise.
Agree Hwy 287 from Helena, then take US2 west at Browning. For a reasonable overnight stop, in Shelley ID, North Bingham County Park worked for us. Envelope pay $20.00.