When I was a kid, our trailer was so small, our bathroom was a Wet Bath. What that means is the toilet was in the shower, literally. Everything got wet and you stood right in front of the toilet. No place to turn around. So we used the bathhouse 99.9999% of the time.
Now taking showers outdoors, in a campground, the gray water police will be paying you a visit!
I think you should try the shower before saying you can't.