Winterization of RV

Go over your uses with the rental agency or person and see what they say to do. Most likely, if you'll be keeping the RV in use (and so running the furnace, etc. when it's cold), there's no reason to winterize or do anything else particularly different to camp in moderately sub-freezing temperatures, though it depends some on the specific RV model in question. You will need to use water from the built-in tank with the water pump rather than leaving the hose connected and using city water, as the hose will freeze if left in the cold weather (and quite possibly damage the campground's spigot as well).