Don't think it would be a worry for you in an 'Extreme Winter Package' RV. My regular '94 Bounder did just fine traveling in below freezing weather and it only had the old timey Alaska Package which really wasn't much of anything other than dual pane windows.
Most all modern bus style RVs have a bit of leakage from the furnace into the wet bay to help keep the tanks warm. If you travel with mostly empty grey and black tanks (you can use them while traveling, just don't start the trip with mostly full) and 1/2 to 3/4 full water tank as water has a high thermal threshold and large amounts will stay liquid for several days even in 20 F temps all day and even when it gets cooler at night. Especially in a RV basement compartment with insulation around and the furnace leakage to it like most bus RVs.
Remember that inanimate objects are not affected by wind chill so if it's 45 F outside, and you're driving at 65 MPH, firstly the pipes and tanks in your RV won't be exposed and second, even if they were, they don't experience wind chill.
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