We ordered a second water tank, but the factory refused due to "wanting all boats to be the same"--there were at least two of the early boats with dual tanks. We obtained a second tank (stb fittings)--which could be modified to fit on the port side. The output hose would have to go thru the foreward bunk storage area.
Ted, Sea Duck, is your tank actually under the berth or is it just foreward of the fuel tank, under the navigator seat?
There is no room to run any hoses under the floor and bottom of the boat's wing deck which forms the top of the tunnel.
I am really sorry to hear that C Dory used rubber strips under the tanks. That is a "no no". As per David Pascoe's site on installation of alunimum fuel tanks: "Do not use rubber strips: rubber contains carbon, which is cathodic to aluminum and will cause galvanic corrosion." Unfortunately to remove the thanks and put in proper plastic strips with 5200 is very difficult, and requires some major surgery on the boat. Makes me wonder why folks building boats don't use proper techniques!