score:3
Looked in the Chilean Ministry of Tourism site and they have a touristic services search where you can search for campings in specific regions os cities.
Besides that I search the Google and found some others like campingchile which seems a good source, even though I can't be sure of how accurate it is.
Mind that Chile is a country with many volcanoes and they may affect your camping plans. Be sure to check Chilean Geologic and Mining Ministry for updates on volcanoes activities.