The only rigs I've seen with 2 black tanks have 2 toilets in them. Are you sure you have 2 black tanks? Ours has 1 black and 2 gray tanks. One gray tank is the galley/kitchen sink and the other is the bathroom sink and shower. The latter is installed in the front drop frame next to the black tank.
What model do you have?
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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