@ Botts: Yes, but that assumes a full hook up site. My concern is that this is not always possible, and that's where I'd like to design for :)
@ Handbasket: I've read quite a bit about the navy shower. Turn it on for a minute to get wet, turn it off, use soap and shampoo, turn it on for another minute. Quite effective/ efficient, but it is my challenge to look for more luxurious ways to shower
@ RangerJay: thanks, that are some interesting suggestions. I did not look into the wet/ dry bath issue yet. It's quite a challenge since there are so many different types of RV. Plus, I don't get to design a whole RV (which is unfortunate, but maybe one day I will). I am still exploring if it is possible to build some kind of shower which can be built-in existing RV's.
@ Tempforce: Thanks for the tips, I will definetely look into those systems. The main challenge is indeed the amount of resources available in an RV, therefore I am also exploring options on re-using the already- warm shower water (with a water filter)
Thanks for the replies ! :)