Just putting this out here again, since SJ is reading here and using our information instead of doing her own due diligence anyway and apparently she wants to move Selmar to the back, tucked away for prying eyes.
French planning laws forbid the permanent installation of a mobile home on private land, whether your own, or that of another person. They must either be installed either on a residential leisure park created for this purpose, either a parc residentiel de loisirs or a village de vacance en hebergement.
Even where they are installed on an authorised site, it cannot be for a period longer than two consecutive years. This is to prevent these sites becoming used for permanent homes.
No formal permission is required to install a mobile home on private land for less than three months (15 days in a protected area), but beyond this timescale the owner must seek the approval of the planning authority. The three month period need not be consecutive.
Source:
https://www.french-property.com/guides/france/mobile-homes
Interesting local news: a British couple is currently planning on setting up a campsite in Le Rimbert, a neighboring hamlet to the HMN. They will probably not like SJ’s practice of hosting camper vans long term.