one. have them in multiple places.
we are still potty training, so two of us have to fit in the stall. we have had to make a wardrobe change and, trust me, trying to help my son with that in a regular portable toilet is an experience.
on a recent school trip, my son’s class took a hay ride to the a picnic area. there had to be at least 40 tables. only two regular-size portable toilets were within close walking distance. at least 10 school groups were there that day and most were eating lunch at the same time. when you have an exceptional child, they often have to use the 