We used this app while [[Campervanning in Australia]]; it was recommended by Apollo, our campervan rental company. We were surprised by how useful it was. In addition to an extensive list/map of campgrounds (including both paid and free, and what kind of vehicles were supported), it also showed many free toilets around the country. It covered New Zealand as well. You could also enter which campervan model you have and it linked to how-to videos for your camper features.