While I don't think you need to worry about cold temps at night as long as it warms during the day, it is nice to not have to worry about it being cold for a day or 2. You do still need to be concerned about the dump valves freezing so it's not a cure all. For prolonged cold you need the heat pads, a heated hose, and 120vac.
I've been whacked a couple times underneath at highway speeds, one 2x? and one roadgater. Tore up the insulation a bit but no damage to the tanks. The only downside is it's a pain to remove if you need to work on something down there, which is not a small matter.
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Happy Motoring
Bob
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