Black Forest, Germany.

Benson

Hi, has any one been down to the Black Forest before? We are going in September and would be grateful for any  advice on which area to stay in, and any camp sites that come well recommended. We also want to stay near Lake Constance for a few days - any sites
there which stand out? We are traveling Dover-Calais and intend to drive through Belgium and Luxembourg on the way to Germany, returning via Rhine & Mosel valley. Will 3 weeks be enough to do this tour(we have a motorhome by the way). Be grateful for any tips.
Thanks.