Hi All, I'm curious if anyone has attempted or has experience replacing the tanks in a 32' 1988 mariner. Right now the boat I believe is configured with a 15 gallon black holding tank below the galley floor. This spot is rather space limited, I measured the current tank at roughly 27.5"x14.5"x10.5" which seems to be a 15 gallon tank. According to the manual, I have (2) 35 gallon (I assume they're the same size) tanks totally 70 gallons below the floor in the salon. The 15 gallon tank I believe will be easy to taken out, not sure about the (2) other tanks but I'm assuming they can be slid around to get out, there's a big opening in the floor.

Here's my thoughts, the 15 gallon waste tank fills pretty fast from my raritan crown toilet and we're often at a marina so we don't really need 70 gallons of fresh water capacity (use the shore hose hookup). So I'm thinking replace those two 35 gallon tanks with roughly the same size, maybe a hair larger if I can, tanks since they are fairly old. That would then give me 35 gallons black & 35 gallons fresh. All new hoses as well, I think especially the waste ones have been leaching odors.

Is this crazy? Any other ideas for how to configure this? I'd likely be just abandoning the space where the current 15 gallon tank is. I'm losing half my water capacity but it's way easier to fill a water tank than it is to pump out a head.