I need to figure out my fresh water storage solution. The original 1968
Streamline Empress used a pressurized steel tank which was mounted above the floor, on the side of the trailer. Above-the-floor space is precious, and so we'd rather find a way to install our fresh water tank(s) in the belly. The most logical place to do this is over the axles, but I am constrained by the dimensions of the steel frame. I envision two tanks which lie in adjacent "bays" and are connected to one another to basically form one large tank.
I'm looking for a tank that is in the ballpark of: 51"L (preferably less) x 19"W x 5"H. There are very few tanks out there that would fit in this space. I also have concerns about freshwater storage in the belly during the winter in sub-freezing conditions.
So I'm wondering if I should go back to the drawing board.
Are there other options I'm not considering? Other, less traditional ways in which I might store freshwater? Maybe I should just bite the bullet and store freshwater somewhere above the belly?
I'd like to get something in the ballpark of 80 gallons, if practical. Use case: we're a family of 4 and want to boondock for at least three days before needing to re-up on water usage.