@Gina That's terrible; I'm sorry you have to consider such a thing.
One idea that came to mind: is there a campervan association that you could join that might give access to more exclusive pitching sites, ideally with proper codes of conduct? My parents were once members of the Caravan and Motorhome Club in the UK, which has 'certified locations' available only to members. Theoretically, a member can be expelled from the Club for harassing another member, although I don't know how well that works in practice.