Looks like they repurposed snow making machines and put it on a remote controlled mini-caterpiler. Snow making machines pictures: https://www.google.com/searc

Looks like they repurposed snow making machines and put it on a remote controlled mini-caterpiler. Snow making machines pictures: https://www.google.com/search?q=snow+making+machine&tbm=isch https://www.google.com/search?q=snow+making+machine&tbm=isch