Some have two tanks with one outlet as ours does but we have a pump to move the waste out of the front tank, others do not need the pump. We haven't had trouble with it,but.........an arrangement with out the need to move the waste with A pump would be less to worry about. Good luck with your search.
2017 Winnebago Vista LX 35F
Lund 1675 50 hp Honda
FMCA F462274