Now some of them are being called a "spray port", with a single quick connect for the appropriate hose with a spray nozzle. Fun Finder put ours right above the electrical connection. They did a lot of smart things on this trailer, but that wasn't one of them.
On our previous toy hauler 5ver, we used the outside shower (a real one...) often to rinse off some of the gunk on us from a day of ATV riding. Very helpful.
You don't want it anywhere near the door entries, or on the opposite side where the water will run underneath the unit and up under the doors if you are slightly unlevel. Biggest thing will be finding where to splice into the water supply line/s, and figuring out whats inside that wall.
