Good process, why do you drain the black water and grey water twice, especially if need to be at sanitary dump? Your procedure adds anti freeze into the water system starting at the pump, which fills all the supply lines with anti-freeze so probably will need more than 1 gallon. Also could you address my main point that the fresh water tank does not completely drain. How much (inches) water if left in your tank when drained? Assuming there is almost an inch in the bottom, what do you do with that?
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