Re: additional potable water tank location
I've found that even 50-100 lbs. of chain will change the charactaristics of my 26' boat, so I imagine that 400 lbs would be a significant change. I'm a big fan of soft water tankage, which I've found at boat salvage yards from time to time. I'm on the west coast, and BLUE PELICAN in Alameda CA, and MINNIES YACHTS in (I think Ventura or somewhere in the SoCal area?) both have rotating stock and sometimes have soft tanks. They drop into an area, only fill that area, and require minimal plumbing. They can also be removed for very easy cleaning or purification. I'd aim for midship locations, such as under quarterbirths or in lazarettes. And if you are able to acquire several small ones, say 20-30 gallons each, it spreads the load out even more and if they are contaminated (mexico water...) it only affects a portion of your water supply. Good Luck, and Fair Seas!!