As another '94 Casita
owner, I was glad you posted your pics. I'd thought that we had a black tank below the trailer, not the thing under the toilet. Did you learn what the capacity was for the black water tank?
In the photo of your Casita
, I see that there are two hatches towasrd the rear on the door side that mine doesn't have. Did you add them? Looks like a water hatch on one of them, but I was wondering what they were.