Yes, added a 40 ltr tank under the camper just aft of the axil. Fitted a 3litre/min marine water pump, sink and tap. Added a t junction off the sink tap for the shower to plug into.
Fill point is in he galley RH, sink and tap in the galley LH
Drains into a portable 40ltr grey water tank I got from the local RV store.. This was a regional requirement to get certified (self contained), In Newzealand we need this certification to use most free camping spots.