I just got my trailer a couple months ago. I did a shakedown trip 2 weeks ago to learn all the systems. I would assume that dump stations at campgrounds are usually pretty level so I wouldn't worry about that. As far as the black water tank, what I would do is have water in my fresh water tank if possible, empty black water tank and flush toilet until all water from fresh water tank is gone. Then dump again. Use the water hose to rinse your sewer hose
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