A new owner of a Big Horn pulled into our camp grounds and is a couple sites down from us. He is not a member or on the forum yet, I've been talking to him about it when I get the chance. He asked a question that I was unable to answer. He wanted to know what holding tank his washing machine dumps into. If I were to guess I would think it would be the gray 1 tank (bathroom sink/shower but I wasn't sure so I figured I would ask hear. He has a brand new B/H the new upstairs living floorplan. Thanks,