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Hi Rod, Two is probably best. If you were to overfill a single tank (and it happens) you will have raw sewage in your RV. Plus you can dump the black water less often and leave the gray open 'til a day or so before dumping the black, close the gray, and after dumping the black use the gray to rinse out the sewer hose. There's probably more reasons..., but if you have a choice/room, I'd go with two definitely. Good luck |