I own one, and have used it on one trip where there was really no other option. Didn't love using it or dealing with it, but I'll bust it out again if I really have to, I won't let something like that keep me from camping somewhere pretty.
I can't see bothering with it for liquid only. Generally you can find a place to go outside without too much trouble. If you're desperate to keep on moving, I could see carrying a pee jug, like the setups you'd deal with in a 3-6 seater aircraft. They are a bit simpler for boys than girls, but solutions exist for both. Not sure I'd dump them out the window like you might in plane though.
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'99 EB ex ENG KSWB news van, low rent 4x4 conversion (mostly fixed by now), home built interior.
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