Thoughts on a weird/unique way to empty holding tanks.

I do the lift method at home and dump into our outdoor clean out. But a pit toilet is dry waste. I would think unless it is very seldom used it would not be an appropriate type of waste. Taking advantage of park facilities in ways not designed for is misuse. Wouldn’t want to be guilty of that. Not sure how 2 week boondocking folks handle more waste than fits in the black tank. Are the secondary tanks big enough? Where are they stored? I’m guessing they are too heavy to lift when filled.