Do you want it for hauling passengers or cargo..
If it is cargo then you should get a Trailboggan from Equinox Ind.
They also make a unit called the Snowcoach. It is close to what you are looking at now.
These are a Canadian made product. They have a US toll free number that you can call. They will tell you who are American dealers.
I know the Cnadian price for the snowcoach is about 2100.00can
The Trailboggan runs about 450.00can
They also make a cheaper unit called the Nordic,175.00can., excellent for general hauling but not as durable or rugged as the Trailboggan.