If you have a recurring problem with the sulfur-producing bacteria, your sanitizing process is missing something. Once you kill off all the bacteria in the coach water system, it should not come back unless you encounter another contaminated source.
I don't think vinegar will kill the sulfur bacteria - use bleach or peroxide. And get rid of that anode - it's not helping anything.
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL