Took the belly cover off and trying to make sense of the mess. In the pic below you see 2 white tanks joined by a green & white flex hose. Are these our fresh water tanks? I always thought there was just one.
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Two 55 gallon tanks.
Should also have a low point drain and feed for the water pump on EACH tank. If not, you will never fully flush the front tank, assuming the rear tank only is the water pump feed.
As long as you have the coroplast down, consider adding a piece of angle to support the center of the tanks. As you see the support is only pressboard, and not very thick.
When I changed my tanks I replaced the OSB with 2 pieces of epoxy coated exterior grade plywood.
https://heartlandowners.org/showthread.php/11977-100-gallons-of-water?highlight=water+tank
//heartlandowners.org/showthread.php/11365-And-so-it-begins?p=135059&highlight=water+tank#post135059
//heartlandowners.org/showthread.php/11365-And-so-it-begins?p=247358&viewfull=1#post247358