We used a bilge pump last year to very good effect - no more shower restrictions due to evap issues! We used a very small pump and constructed an A-frame from 1/2" EMT; a 4" diameter piece of ABS pipe along the top of the A-Frame with end caps distributed the water through holes drilled in the botto...

My mutant vehicle (RoboShaw) uses a car stereo amp driven by an IPod - works really well. The car gear is pretty playa-proof; the IPod lives in one of those thick rubber cases in case of shock... make sure to prep playlists, though; driving the art car while searching for tracks is not a good idea. ...