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My coach is plumbed the same way. All the recommendations for black tank care are to use plenty of water in the black tank to aid in draining and to prevent clogs. Having the bathroom sink plumbed to the black tank helps ensure there is adequate water. Not really a bad idea.
As for the odor, if all seals and vents are working properly.. shouldn't be an issue.
As for the fan, do not have it on when you flush, otherwise you'll be in for a surprise.
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