A few suggestions based on what you are interested in:
1) Consider adding a stop at Waterton National Park (across the border from Glacier National Park). A side trip to Head-Smashed-In-Buffalo-Jump may be something you'd be interested in. Also consider going to see the Frank Slide.
2) From Waterton, you might wand to go to Drumheller to see the Tyrell Museum and the areas around it.
3) Peter Lougheed Provincial Park and Kananaskis Country is a good destination. It is far less crowded than either Banff or Jasper. There are a bunch of good hikes in the area. The best campground to stay in is Mount Kidd. There are other provincial campgrounds further south in the park, but they do not have cell service and most of the sites will be too small for what you are travelling with.
4) The Tunnel Mountain Campground in Banff is an ok place too. Be careful on which part of the campground you book in because fires are only allowed in a small portion of the CG. The other campgrounds around Banff will not fit your rigs. Canmore is only about 15 minutes away from Banff. Lots to do around this area.
5) The Lake Louise Campground is about 50 yards from the main railway tracks. It is NOISY. But it is also one of the only serviced campgrounds in the area, and it is very close to Lake Louise town. This area is very beautiful and there is lots to see here.
6) Icefields Parkway (highway from Lake Louise to Jasper) - it can be tricky to get camping in this area, but it is very beautiful too. Definitely go to the Columbia Icefields.
7) Jasper - smaller, more rustic and less touristy than Banff. Whistler's is a good campground there.
Make sure that you have all your campgrounds booked as soon as you can. Parks Canada has opened up the booking earlier for the upcoming year so you can book in mid-January. Mount Kidd and any provincial parks typically open 90 days before arrival.