http://www.trailmanorowners.com/foru...black+capacity
This is the only modification that I've heard of that increases the black water capacity. I don't know if there are still pictures of what he did, but he describes it pretty well in his posts.
A few years ago with one of the board upgrades ? I think we lost all of the older pictures.
Now that dinner is over, I found a couple pictures in post #35 of that thread. I'm going to go back and post on the thread "black water tank" so that it comes up in regular searches. Also put a tag on the post for "black water tank".