Amazon sells a cap that replaces the cap on the sewer pipe you hook your sewer hose to. Which has a fitting to hook up a water hose. If you use a short hose it might make it easier dumping the gray water. Haven’t used mine yet, but have used the 21 gallon tote and it wasn’t hard moving. Should have bought the larger tank.
We can replace the 3" discharge cap with one with a garden hose fitting. I pump the gray water into a 20 gallon bladder on the tailgate of my TV then off to the dump station. The bladder folds up to the size of a book. This is like a 15 minute job. The pump is a 120v cheaply from HF.
Not sure about your RV. But we just spent 6 days and 5 night not hooked to anything. Didn't fill either tank or run out of water. 3 days of that time was 3 people taking showers and no one was stinking.
True boondocking is all off grid. But wife and I agreed a swim in a lake river or creek counts as a shower. Also a pool if you happen to find one. Lots of state camp grounds are electric/water only. Those we use the public showers.
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