>If the southern hemisphere (where the Vanagon is RHD, and winter/summer get
>turned around, and the drains flow counterclockwise and are not electrical),

Actually gravity-powered drains are not totally affected by coriolis effect
(it's NOT a force) and can rotate either way. Yes, even in the northern
hemisphere. try it...you'll see both directions of rotation. The smaller
the vortex, the more chaotic motion has an effect. Hurricanes ALWAYS rotate
in a certain direction. Tornadoes normally do, but exceptions occur.
Whirlpools readily spin ambidextrously. Serious.