I see a few problems with that idea.
One, the tank will have to be fairly small to remain manageable in both size and weight.
Two, the connections to the head are far more prone to leaking sewage if you have the tank removable, as you'll be constantly disconnecting and re-attaching the two connections.
Three, the smell from the installation will probably be a lot worse than a proper fixed tank installation.
Four, do you really want to risk dropping the tank and having gallons of sewage splatter about the cabin and furnishings of the boat when you're trying to carry the tank out to empty it?
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.