Yes it is, and yes they're allowed to plumb it that way.
Her experience is different than most. I would consider the vanity sink to be a minor contributor of water unless you leave the water running while brushing your teeth, etc. The shower, on the other hand, would be a major contributor if it was plumbed into the black tank.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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