All my Süssmann information, with the exception of my grandmother's birth, marriage and death certificates, is from the Deutsches Geschlechterbuch, Volume 159, page 525-539, since very few records from that area are available at the LDS Library. I have my information on ancestry, but I have discovered that the ancestry search engine doesn't like the "ü" in the name, won't pull it up. I also have a website, and if you like, you can get all my Süssmann info there:
www.zandergenealogy.com (Bachmann section)
There are still Süssmanns in that area, although I have not contacted any of them yet. You can check the German telephone book at
http://www.teleauskunft.de Let me know if you have any success and good luck!