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Forrest, Thank you for the tip. I do have some concern about shimming up the tank as I don't wish to put any stress on the drain assembly. I have not looked at the tank or drain assy, so not sure if the concern is justified. I am guessing I just need to remove the screws holding the bottom...

Freex4, I agree that the open windows would prevent the venturi effect from happening. Our windows were closed with only a roof vent open at the time our flooring lifted up.

SeanFalcon, Our 28BHS had the same issue while towing one hot day. We had left the bathroom roof vent open (we have MaxAir covers) and I believe the air rushing over the vent at 60mph created a venturi effect (created a vacuum) in the camper that caused our floor covering to lift. I have added...

Our 28BHS that we purchased in April 2008 has the same problem. When the black tank is fully emptied, there is still several inches of waste, paper, water and chemical sitting below the opening of the tank. The tank can show empty, but it's still there. I have also tried increasing the lean...