Hot water shower? Try hotwater bath!
That would actually be pretty awesome for winter riding. Just everyone but the driver chill there in their wetsuits being nice and toasty until it's their turn to ride. After you're done, hop back in and get warmed up instantly.
The only downside I could see is the time it would take to heat up the water while you're out there as you obviously wouldn't trailer it full. Well that and you'd still have to dry off at some point when you got out and then you'd be cold. Definitely a cool idea.
All that ballast :drool