Assuming that you have only 20 gallons in your fresh water tank, and nowhere close by to drain your gray water tank, and therefore don't want to keep putting water into the "system" when there's no place to let it out.
Some of the state parks around us don't have dump stations; they tell you to go use the one at the KOA, and it costs $8 to dump.
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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