m2cw try this for a commercial set up:
http://www.cabelas.com/cabelas/en/templates/index/index-
display.jhtml?id=cat20097&navAction=jump&navCount=1&parentId=
cat20075&parentType=category

or  http://www.zodi.com/

or home made:  http://groups.yahoo.com/group/syncro-
org/files/Text%20Files/Westy%20Shower

I can't find the URL but one guy had a shower head in the rear lid so
that when the lid opened the shower head was in place and then the
curtain idea around the lid.

My idea (for the futrure) is to put 12 volts to the rear of the van, buy
an extra westy water pump so that I can sink the pump into any
(gerry) can and flip the switch and get water squirting everywhere.
Like most of my bright ideas, there is probably a problem with this.
Malcolm