While stumbling around the Internet, I came across this very intriguing vehicle for traveling across snowdrifts. It was invented in the 1920's and was known as the Fordson Snow Motor:
And YouTube has fascinating footage of it in action -- the Fordson Snowmobile
The look and movement of this thing really intrigues me. Any ideas on how the Imagineers could draw inspiration from this concept and create a unique ride vehicle?