The only reason you don't know is you're stuck on tractors. The OP doesn't own a tractor yet, why buy one?
Why bend your neck for 3+ hrs each snowfall? Go FORWARD!
North Cascades - Snowblower in action. - YouTube
That certainly looks like Stevens Pass on State Route 2.
The nice thing about the newer tractors is that you can
purchase them with either a swivel seat or a bi-directional
tractor that articulates(swivels in the middle)
A standard row crop tractor or an articulating tractor
would be more than enough for the five foot wet snows
up there as you would not be movong any faster than
176 feet per minute anyway which is 2 miles per hour.
The isssue with snow in the Cascades is the
one foot per hour snow falls with silver dollar size snow flakes,
the compaction of it, and the melting cycles making it very dense
when you are trying to remove it.
The unit in the video you provided us is a Sicard two stage snow caster with two engines
I believe-one for propulsion and the main engine for the snow clearing head.
The thing is that a high horsepower four wheel drive row crop tractor with an
Erskine or Degelman silage blade/plow and an 8 foot snow caster will be more
than adequate for the work as the tractor will have snow chains and loaded
tires as well.
It is simply an opportunity cost problem in economics 102 where the only
unknown is the funding available.