It does have 4 tanks, 1 grey for shower and 1 black for rear bathroom, rear bathroom sink drains into black tank I believe to help keep black tank from getting plugged from toilet and toilet paper, it also has 1 grey in front for bathroom sink, kitchen sink and washer dryer if equipped, and 1 tank for black toilet water, we have stayed for a week without hookups and the only tank that we had get full was rear grey due to showering everyday
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