Recommendations for the Black Forest

Hi, we stayed at camping Hirzberg in Freiburg a couple of years ago and took the train for day trips to Titisee & Schluchsee. Thinking of returning to the area next year but would like to try somewhere different, maybe eastern or northern parts of the Black Forest. 

Does anyone have any reccommendations for good caravan sites in the area? We'd prefer adult sites (peace & quiet) if possible!

Thanks in advance,

Richard