Just a heads up for anyone with a new rig. First time we used the black tank flush we ended up with water in the bathroom. Turns out that whoever installed the unit somehow put it together wrong . When we turned on the outside water to flush the tank, water came out of the top of the one way valve. Took it apart to discover a spring and ball that were in the wrong side of the valve. Moved them to the other side and no more leak.
It would be nice if Crossroads would address the black flush flood problem in assembly. My trailer's two years old and had the too common issue of the black flush connection hosing down the back of the electrical panel.
Had simular problems on new unit picked up in July 2014. Water flooded bathroom sink cabinet with water runing supplies and running under wall and reaching carpet. Used many of the dry towels in linen closet and dryed everything up. Found problem to be loose connection inside under bathroom sink when black tank connection is located.