Here's a simple way to add an outdoor shower to the back of your van. It came out pretty nice so I thought I would share.
My wife sewed 3 standard size shower curtains together to form a loop which keeps water from splashing inside.
] Plastic clamps broke, changed to 1/2" rubber insulated metal clamps.
Shower curtain rod is an aluminum tent pole.
Found these S shaped carabiners at Home Depot
The whole setup fits in the rear door compartment
I had some old redwood that I used to make a shower mat. The slats are strung together with marine grade shock cord and copper spacers.