John, there is no problem taking a big rig and a toad through the Canadian Rockies and the rest of British Columbia -- the roads tend to follow river valleys, and even the passes are pretty good. If you have never driven the Icefields Parkway, you are in for a treat -- plan on spending at least one night at the Icefields themselves -- the RV campground is essentially a big parking lot -- this is the view from that campground:

There are campgrounds with full or partial hookups in Jasper, Lake Louise, and Banff. If you have a few minutes, here is a link to one of our blog posts -- we have several from September and October of 2012:
Banff and Jasper