Hello, I recently bought a 37/40 with a tiny, smelly bladder holding tank located under the vanity in the head. That can't be the factory solution. At the moment the only options I can see for adding a rigid tank are the v berth area, which would require parallel hose runs for fill and discharge along the port side beneath the settee and through the hanging locker on that side, or aft under the shower pan through the aft cabin furniture to the port side cockpit locker. The v berth location would gain me up to forty gallons but require over forty feet of hose run. The aft locker location is a much shorter run but might only get me ten or fifteen gallons (has to clear the manual bilge pump handle). Neither seems like it would satisfy a typical factory installation requirement. What do other owners have?