text: You're correct about this. Nearly all danish camp sites were at one point mapped by one particular contributor and in the process incorrectly tagged tourism=caravan_site. At the time I personally wasn't aware of the difference and I guess very few other active danish contributors weren't either. Currently there are roughly 400 danish sites (as can be seen from http://overpass-turbo.eu/s/hT2) tagged as tourism=caravan_site of which only a few are actual caravan sites. Currently I don't have the time to sort out the issue, so if you want to do it, you are more than welcome.