Hi and welcome! In my 1707T, there are no water lines that I know of that are "below" the trailer. All my water lines run under the couch on the "drivers" side and are accessible through two doors under the couch. From there, they run under the small cabinet, under the fridge, then under the shower pan and under the kitchen sink. Everything is above the bottom flooring of the trailer. I suspect if you left the access doors under the couch open and maybe the doors of all the cabinets open, nothing would get too cold.
The only "exposed" line that I'm aware of is the short line to the external drain on the curb side. That could certainly freeze.
And, the fresh water tank itself MIGHT get cold enough to freeze, because it IS exposed to the elements under the trailer. But, I suspect that depends a lot on the average temperatures when you will be camping. If it warms enough during the day, I think you'd be safe with night time temperatures down to 25 F.
However, your thought of using a 5 gal tank inside the trailer should also work. Since you are heating the water heater, it won't be in any danger of freezing.
And, I think putting antifreeze into the black and grey tanks should indeed keep the emptying valves from freezing shut. I'm sure there's very little "mixing" at the black water valve. The gray water valve should be in the discharge line too, so it shouldn't get much mixing with unprotected water either.
- Jack
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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System, SoftStartRV mounted on A/C
2024 F150 Platinum FX4 3.5L PowerBoost SCrew
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