Allen - Your route is ok and shouldn't be an issue. There are a couple of less desirable stretches for a large MH and toad, but they are not that long:
1) Kelowna - there really isn't a simple way through there other than the main road which is usually VERY busy. Try to do this either early or late in the day to avoid the traffic.
2) Golden - there is a very curvy stretch just past Golden on the TransCanada but semis travel it all the time so just take your time and you'll be fine. Best to do this in the daylight.
3) Calgary - there is a ring road around Calgary now, but even taking the TransCanada right through the heart of the city isn't too bad.
Recommended stops :
1) Summerhill winery in Kelowna. Good wines and great restaurant with a nice view.
2) Radium hot springs - would be a side trip off the TransCanada but this road is nicer and the springs are good. Lots of RV parking there too.
3) Lake Louise is beautiful and worth a stop. I would not recommend staying at the campground there unless you are comfortable sleeping with earplugs. (The train tracks are very close, and they are busy.)
4) Icefields parkway - north of Lake Louise. Take the Toad up to the Columbia Icefields and do a tour. Some of the best scenery in the world.
5) Banff - Tunnel Mountain campground is ok and right next to town. No fires in most of it though. The convenience to Banff is really good. Lots of stuff to do in Banff too. It is very touristy though.
6) Calgary - you might be close to Calgary during the Stampede. If you are, make sure you go to the Chuckwagon Races. The rodeo is good too.
7) Drumheller - Check out the Tyrell museum.
From Drumheller to ........ Winnipeg there is not much for scenery or at least it is a lot different than the first part of your trip. :)
Enjoy and welcome to Canada. Just say "sorry" and "Eh" lots and you'll fit right in.