If you get down and peer under the trailer, you will see that there is no place anywhere near the toilet where a black tank will fit. Many have asked, but I know of no one who has tried to do it.
Exception - years ago, one member did find a way to run several feet of 4-inch black plastic pipe around the perimeter of the underside of the trailer, and use that pipe as a black tank. I can't find the post at the moment - it was many years ago - but I don't think we ever had a report of how it worked. I'm not at all sure that it would fully and cleanly drain, leaving "crud" lodged inside. You would have to provide a cap of some sort at the far end, so you could hose it out occasionally.
Bill
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