@outside.the.9to5 my main water tank and gray water tank both hold about 26 gallons, then there's a separate removable 5 gallon tank just for drinking water as Hernandm8800 mentioned.
@Hernandm8800 So sorry for not getting back to you sooner, and sorry to hear about your window! Not sure where you can source them but I know there are manufacturers out there that make them (mostly UK based). This is just
one example but I'm sure there's more. You could maybe get a custom made one, or buy one that's roughly the same size and adjust the existing hole to fit. Not an easy task either way, but I'm sure it could be done.
Re: the fridge; maybe you already figured it out, but Mobydick 11 is correct about the screws in the face and side, but you also have to disconnect the propane line. I don't recall exactly how I did it, but I think I had the drawer and the stove removed at the time making it easier to get to the connections. He's also right in that you'll likely have a lot of wood rot back there. I'd removed the gray tank and ended up putting new plywood panels from underneath. A lot of the leaks come from the fridge vents in back so I sealed them up as best as I could. I think I'm still getting some leaks from those screws Mobydick11 mentioned as I don't have a trim piece covering those, so will tackle that soon.
@mobydick 11 those double cab Doka Syncros are some of my favorite vehicles.Would love to see a picture!