All Class A Outlaws have forced air heat anti-freeze vents from the propane furnace to select bins. As long as you run the furnace at levels that keep you comfortable, the water and waste tanks, and plumbing will not freeze.
You must use the propane furnace for this to work. Electric or catalytic space heaters will only heat the RV interior and your service bins could freeze.
This will not protect the engine oil...use the engine block heater for that.
This will also not protect the shore ties (water and dump lines)...drain the dump line and shut-off and drain the water hose before hitting the rack.