I set up a shower tent to prevent the grey water tank from filling up quickly when we boondock. Our previous camper had an outside shower, but our current one does not, so I bought some adapters from Lowe’s to connect a hose to the low point drains, and a sprayer for the other end. The shower tent fits nicely between the 2 slideouts. Similar to this one;
https://www.amazon.com/Portable-Changing-Adventures-California-restrictions/dp/B013S9EMVW/ref=sr_1_19?ie=UTF8&qid=1522284836&sr=8-19&keywords=2+room+shower+tent