I sorta added an outdoor shower and then some.
My low point drains are 2 angle valves under the kitchen sink with PEX extending down through the floor and hanging 4 inches below the fabric ender belly. I added a Flair-it PEX x 1/2 male pipe thread fitting, brass 1/2 fem pipi thread x 3/4 male garden hose adapter and a female garden hose x quick connect garden hose fitting with built in ball valve to both low points drains.
I can close the ball valve, open the low point drains and use the hot and cold water independently as needed, connect both lines to a laundry room sink with faucet or connect the cold water low point to an outdoor Eco temp water heater with shower wand and hose. I can also connect the water heater hot line back into the trailer hot low point for on demand it water use inside the trailer.