Hello I have a Bonair Oxygen
. I had a shower installed by an Rv shop. Under the bed you will have to add a T connection to the hot water line and another to the cold line. From there you will need to add a shower faucet and shower hose. You can install the the shower support on the wall separating the toilet from the sleeping area. A hole in the floor for the drain will go link the grey water piping to the one for the sink. You don't have a grey water holding tank so when you use the shower you will either let the grey water out or need an exterior gray water holding tank. Also, the Bonair Oxygen
comes with an only electric hot water heater. Since I like boondocking
I installed a tankless water heater. If you need advice on that let me know.