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I have a 2022 3791RD which is fundamentally the same floor plan. I have experienced the same issue. When the unit is level, the tanks drain VERY slow. I allow the grey tank to fill before draining. The black tank, I keep the flush hooked up. I run the flush to add volume and then pull the drain. Again making sure I have as much volume as possible. When we are preparing to leave, I run the front jacks up high before hitching and make sure to pull the drains and thoroughly flush. The galley tank doesn’t appear to have the same issues.
Maybe someone else has a better solution? I am hopeful 😊
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