Make sure that the unit has the capacity to hold one tank in the trailer, what I am saying is this as an example your biggest tank is a 37 gallon tank capacity and the tote should be minimum 38 gallons or more, that way you are not left with a partially empty black tank and a full tote with a hose also full, I have a gray tank that is 27 gallons and the tote is 32 gallons, the black tank is 24 gallons, so I know that the connecting hose is wet but not full of goodies and I can still rinse the hose a little with some water after disconnecting from the RV and before disconnecting from the tote.
navegator