I just bought this camper and don't know much about the camping trailer world just yet. I am noticing that this camper has two black pipe connections. One is in front of the axles and one is behind the axles. One is for black water and one for grey water if I am not mistaken. The question I have is, are these tanks connected to each other in any way? Or, does one have to dump each tank seperately? Thanks in advance for any help.