How cold is too cold for the underbelly tanks?

[Jagiven]

How cold is too cold for having water in the tanks under the TT? I have an open underbelly. It appears this weekend’s lows will be around 24 deg F at night. The day time highs will be around low 50’s upper 40’s.

It will not freeze solid, but we certainly could have some ice building up? Maybe there will be enough radiant heat from the TT to keep things thawed.

[3'senough]

If it's windy take your time down to half what you might think as the cooling will be faster. The more liquid in the tank the better as it will hold heat longer and take longer to freeze up. Maybe even invest the 2-3 bucks for the pink stuff and drop some in each tank if you are really concerned.

If on a city fitting which would be hard to believe based on the conditions, but if so consider leaving something trickling all night to keep the pipes and hose from freezing up and the grey cracked to keep this from filling as a result. If using your pump then make sure the tank is above half full to hold temp.

Your underbelly is only heated when your heat is on and the ducts warm the area. If you are not using the heat much this area will not heat up as a result.

[Jagiven]

I should clarify; we will be camping this weekend in it. The campground called and said they are turning their water off to the sites so we need to fill up our freshwater tank.

[tlhdoc]

If the camper is kept warm you should be ok. You might want to open any doors where there are water lines so that warm air is in that area. Also run the water if you get up in the middle of the night.