I have a 2011 Windjammer 3002 ... the one with a half bath in the middle. I would like to know the layout of the black and gray tanks. I have a gray galley tank, two black tanks, and a gray tank for the main bath with shower. What I don't know is where does the gray water (sink water) drain from that middle bath. Does it drain to the galley or to the main bath, or perhaps it even drains directly into the black tank from that small, middle bathroom. A schematic would be nice, but haven't seen one for this trailer. Thanks, Sandblaster.