I grew up in New England and skiied a fair amount. I remember Tuckers being by far the most numerous Sno-Cat used at ski areas.
Stratton Mountain also had a fleet of very unusual snowmobiles. They were made by Bolens and IIRC were called something like "snow huskies". They were a two part machine with the engine and tracks on the front part. The operator sat on the second part, sort of like a sulky on skis.
Thanks for sharing the photos...