Our 2250GBR has a little on board sink. There is about a 5-10 gallon fresh water tank under one of the seats, with a 12v pump. I don't like the fresh water tank, there is no way to drain it and if I forget to fill it, we can't use the sink. So I'd like to mount a pump on the back of the 'toon so we can just use lake water, there is a square bracket there that I assume is there for that reason. Has anyone done this, or is there place to purchase a pump like that? Or has anyone added a water pump back there and willing to share pictures?