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Ours has 2 gray and 2 black. Has a bath and half, full kitchen and washer in garage. They drain the washer to the rear black.
I think it's not such a bad thing. We seldom use rear toilet, as I think most do. For us full time living and we use the washer ( Splendid 710xc ) about every day she to its small capacity. The blacks fill at about the same rate. And one benefit as well,, the detergents in the wash waste water cleans the rear black tank well. The rear black tank sensors seldom get 'hung up'on the level indications
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