On link below you can see HPI build a new waterproof firestorm flux with sidewinder esc. Hey castle do you have any plans to make a waterproof MMM? http://www.bigsquidrc.com/
Waterproof Sidewinder would be great for scale crawlers.
I don't get why HPI would put it in a 2WD stadium truck though, they don't really make very good bashers for mud and water IMO. But I guess the Slash is 2WD and people get those plenty wet.