cm,
All were open below. I got a similar response when I asked the question. I will probably fab something up my self. I can attach a flat plate with two legs to the side of the adjoining boxes and place a piece of foam insulation on the floor. I did get the heat tape in mine.
I've been told that when you drain the tanks, you need to dump about a gallon of RV antifreeze in each tank to keep the drain and valve from freezing, other than that the heat tape works fine.
Domestic water is all above the floor, so as long as the coach is heated you should be ok. Keep an eye on temps in the undercounter cabinets where much of the plumbing is. You may want to keep the door open a crack. There is usually a flex heat duct in there that blows out the side of the cabinet. I may put a tee and balancing damper in the cabinet to let a little air flow in. We'll see how it goes.
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