I decided that we might find a gray water tank useful. A suitable place to carry it out of the way was needed. I did lots of looking and found nothing similar to what I had in mind. I really did not want to lose space on the deck. Lifting it up there was not something I was looking forward to either. Hanging it underneath seems like a good idea. We won't need it all the time and it will be handy when we do. The aluminum diamond plate tray hangs down an inch lower than the fresh water tank. No lower than the stabilizers or the accessory tube that we mounted just in front of it. Hinged on one side the ramp makes it easy to deploy and "I hope" easy enough to stow. I decided that a ten gallon tank would be enough. That is half the fresh water tank. The size is right to fit underneath without hanging down too low, or being too heavy to stow when full. Just thought I'd share the idea. Good , or bad? Time will tell.