Extending the shower hose

Is your galley sink closer to the door? Just get a garden hose sink fauwcet adater...they used them in utility rooms before the faucet came with hose threads. Your galley sink may be closer. The typical shower head shut off drips, so it would need to be outside before you turn it on, then how far from the door will you use this...could be a big mess outside...even with Lance outside shower opposite side from door which I have used in the midddle of a forest, I had to make sure the ground slope didn't send the water across under the truck to the door...then you can get some garden filter cloth to stand on to keep feet clean...have you looked at all the factors? Also if going to do this go to a custom hose shop and get a proper length made up using flexible no kink hose...it is a cost effective way to go rather than a make do set up. Just some thoughts and I do not like aggrevation caused by myself...so I really think it out..but that is just me! Good luck!