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Does your 2005 Montana have the low point drains inside the basement storage or hanging underneath? If underneath, there will be two lines next to each other. Those may freeze when you get into the very low twenties (from our experience). But they'll thaw as the temperature warms. Or, you can take a hairdryer to them (have done that). If yours are inside the basement, they'll not freeze at those temperatures.
Keep all tank valves closed so there is no water in the dump pipe hanging below the belly to freeze. Or in the sewer hose.
Set the furnace to run occasionally so heat is pumped into the belly and you'll be fine.
With our 2003 Montana we were down to five below zero (F). We did have freezing problems with that one before I did some insulating of water lines in the belly. But if you keep the furnace running occasionally you should not freeze the water lines at those temperatures. Except the low point drains if they hang below the belly. After I did the insulation we were down to about 5 degrees above zero without freezing. With this new Montana we've never frozen up.
Also, disconnect your fresh water hose in that really cold weather. It will freeze and could possibly pop the park's water spigot line if it's not heat taped or insulated.
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