I have two aluminum tanks that are properly mounted so that they sit above the bilges and have air space all the way around. I doubt they will ever need to be replaced for corrosion issues. However, I have been considering a trip that might require 250 more gallons than I presently have tankage for . One way of solving this would be to have a custom polyethylene tank made that used the bilge space for for greater capacity.
The other possibility would be to just add a bladder tank to my lazarette.
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