Recently we decided to go on a short local holiday (COVID Restrictions meant we couldn't travel far or interstate). We hired a camper van for 5 days (4 nights).
Naturally we decided we would bring our nappies, as we don't really know any different these days.
Although we did stay at a Big4 one or two nights, the laundry was usable at the times we needed.
We started by estimating how many nappies we would need.