Two issues I think the proposal should address: 1) Use separate tagging for a place you can park a caravan or car overnight (as per your example), compared to a place you can pitch a tent without getting hassled. They really are not the same thing.
2) Tagging large areas. For example default rules exist in the USA on land of the US Forest Service (USFS) land, or Bureau of Lumber and Mining (BLM). Camping is generally allowed anywhere it's not specifically prohibited. Yet within those areas are established informal campsites. It's not clear if OSM should tag these large areas with a camping tag, or simply inform the prospective camper of who owns the land. Regulations change from time to time, so it's perhaps best to refer the reader to the official source: the website of the owner, land agency, or store. OSM here is acting a bit like old "hobo chalk marks", where transients would leave coded symbols to each other about places they found food or shelter. It exists outside the official realm. Readers of a map however should be clear which camp sites are "permissive" (e.g. you might get away with it) and which ones are "official" (a rule says it's OK to do).
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