how do you gain your 100 gallons? (not that I would ever go that big)
It has a 65 gallon transfer flow tank in the front of the bed plus the two factory tanks.
Previous owner had it all rigged up that way when he bought it new, even had them install an extension from the tank to a custom filler neck opening in the camper shell. You can see it on the driver side right in front of the window.
I love the reactions from people at the gas station when I say "$300 on pump number one please"