[9YearLurker]

“Snow coaches”?

[george76]

Snow coaches are shuttle vans or buses mounted on oversized, low-pressure tires or tracks, similar to snowmobiles.

Snow coaches typically have big picture windows..

https://www.yellowstonevacations.com/tour/west-yellowstone-snowcoach-tours/#gallery-contact

[deport]

Several different colors and designs.