Join Date: May 2009
Location: Anywhere but social media
There are large parking spots for both Siffleur Wilderness - Devon Lakes (Mosquito Creek on Icefields) and Red Deer Lakes / Douglas Lake (Fish Creek above Louise). It is generally safe to leave the car overnight. But of course there is question of wasting money on rental that is now not used / parked for several days.
Kokanee75 has a good point about National Parks vs BC. Less crowds too. But when you are somewhere for the first time, you tend to focus on better known areas and then expand. I.e when I moved to Vancouver I started from Grouse and Seymour first, not Pemberton or Duffey peaks. Canada is known around the world for Rockies and you have to see places like Lake Louise, even if crowds nonsense works like bug repellent. Another example is Berg Lake trail. Stupidly popular in summer months (specially by Europeans). But you must see it. Just had discussion with someone local that climbed many obscure peaks, but was never @ Berg Lake. You have to go there. Period.