The other problem you will run into is the fresh water tank capacity. If you are not on full hookups or at least with water you will use up your water supply rather quickly.
If you are on a site with water available and do not have a sewer hookup then the grey water holding tank will be your limiting factor along with the fresh water availability.
Good luck with managing the water useage. Let them use the RV and you go to the campground shower. They then cannot blame you for using all the water.
Good luck and keep us informed.