The full service campgrounds in Banff National Park include Lake Louise and Banff Tunnel Mountain (which is walking distance from Banff townsite). The full service campground just south of Jasper is called Whistlers. All are good, but busy.
For your drive south to Glacier Park, consider driving down the Kananaskis Highway 40 (good camping at Kananaskis Lakes), cut over to Highway 22 south of Highwood Pass, and spend a night at Waterton Lakes National Park. The townsite campground is full service and excellent.
All these campgrounds will require bookings.
Have a great trip!!
Bob and Nancy
Cheer Up, Slow Down, Chill Out!