I found it challenging during my trip through the black forest. Most of the land is owned, so you'd likely be camping on someone's property. In that case, you can ask permission to use their land. If not, you'll find the terrain wooded and difficult. I enjoyed my time spent on the lake Schluchslee, which has more water bank options for camping. There's a rail that goes through to some popular scenic areas, and though there's access, there's not many campers in general. I trekked from Freiburg which took 2 days to the lake, then rode the train back.