The image wasn't found. I can't see it.
http://www.homeboyski.com/wp-content/uploads/2008/12/coolest-sleds-winter-lightning-3-pack.jpg
Sled already exists in the form of the toboggan. Snow you could easily event and dupe yourself but you'd need to place it manually and it'd send brickcounts through the roof.
I don't want the toboggan. I want a simple sled.