Again, going back 10+years, we did it with a truck camper through Canadian Affair. Costs were quite reasonable IIRC. Basically a chevvy/GM/Ford pick up with a camper unit strapped to the load bay. Although youre not meant to go ‘off-road’, the trucks are 4wd and good ground clearance and some of the roads in the back country were graded anyway.
‘Wild’ camping was an option to a degree in the less frequented places (Elk Lakes Provincial Park I think was one), although back then the Provincial Park campgrounds were really good anyway and I doubt if things have changed that much.
Summer months do get busy, we would go either Spring or Fall.
Great place, great people, great lifestyle, my spiritual home and ended up buying a place out there – which I’ve now sold. Too old for work permit, even then, so the memories are fab! Enjoy