I assume doing that would work. With heated tanks I wonder if there'd be enough heat transfer through the water in the pressure lines, assuming you're not talking (1) extended cold like below +20F and daytime temps get up into the 40s or higher. (Thankfully, I don't think we've had a handful of nights with below +20F the 34 years we've been here in SW Okla.)
FWIW, completely different setup but this is what I do. My work schedule gives me a long weekend every other or third weekend so we're off to just get away unless the weather's just too uncomfortable. Both parked in an open barn. Experienced no problems.
The 5er we had had a plastic corrugated cover ("insulation") covering the entire belly. I put a couple of infrared lights under where the black & grey water and fresh water tanks were assuming they'd produce enough warmth to keep things fluid.
With the coach we have now, everything is "inside" but the tanks aren't heated. Whenever the temp goes below 30F I turn on the electric heat 60F and a 100W incandescent bulbs in the two belly bays below the water tanks.
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DC & Mac
2019 Vista LX 35F (Cayenne)
"The Okiebago"
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