My wife and I ordered than had to cancel a new 2015, 3150 Big Country due to health issues. Are plan is to order another one this winter but after reading the review in Trailer Life magazine on the exact model we ordered I have one big concern. Why would black tank water back into the kitchen sink when a hose is connected to the fresh water inlet. The editors said the confusion comes from having two intakes one labeled fresh water and the other labeled city water. They never found or least published the reason for the tank discharge into the kitchen sink. What gives?