One thing was brought to my attention in the past few weeks that I never would have thought about. A co-worker of mine bought a new Freedom Express this season and had it out on its maiden voyage. When he came back, he asked me the surest way to know if my bathroom gray tank was full. I told him when the water starts coming up out of the floor drain in the shower (I have 2 gray tanks). He said that he filled his and it came out of the bottom of the TT. It ran everywhere, and totally soaked everything under the underbelly cover. When he took it back to the dealer, they pulled the underbelly cover and saw that the vent for the gray tank was under the TT. He was told that the factory confirmed that was the design, he should have been keeping on eye on the tank level indicator and that he was responsible for the "flood". One thing to look at would be where all the vents are. My cousin has a Denali and the kitchen/bathroom sinks vent into the cabinet under the kitchen sink LOWER than the P-trap.
