Uhm, how about just unscrewing the trucks from your board, I bet you'd get down the slopes just as well.
Actually, taking off the trucks instead of using this kit will give you more surface area on softer snow, and if it's really soft snow, the kit would just generate drag.
Problem with my idea, and this kit, is that there's no wax, or edges, so really, just grab a snowboard, mmmkay.