>>How about a tank on the luggage rack, would be heated by sun, simply
>>run a hose and take a shower by gravity feed?  Anyone tried that
>>method?  Might be a little tricky in cooler climates, though...

That's how the Adventurewagen does it. There's a 4.3 solar heated tank
mounted atop its' fiberglass raised top. It is accessed through a moon roof
hatch and a standard shower hose/wand can be attached. Came with a custom
shower curtain and 24 quart Rubbermaid catch basin. The difference between
my setup and what you describe for a Westfalia is that my tank is about 76"
above the cabin floor. Your luggage rack lower and may not supply sufficient
pressure when in a standing position.

Garrett Adams - Stockton, CA
83.5 Adventurewagen GL