theres people that live around the flathead that ski backcountry everyday ranging from glacier park, to the north fork, middle fork, whitefish range, mission mtns, jewel basin.... all over. as far as sleds go, the people that have them use them, ive been fortunate enough to go out several times with friends that had sleds and had awesome times. i think if i stay living in whitefish, i may not buy a pass next season, and invest in a sled.
other than the flathead, ive heard cooke city is awesome for sled access. i think some film crews went there this last year, i cant remember what movies.... though....