Humidity inside the RV may be a problem in winter, especially in a coastal area. Expect your windows to ice up even if they are double-glazed, and expect ice build up inside in various places.
If the lot does not have electric service yet, you may not be able to get it connected/energized until you have a building permit for a house. This is intended to prevent folks from indefinitely 'squatting' on a property in a trailer. Building permit comes before electric permit.
Those who we've seen living full-time in the RVs in RV parks in the Anchorage area have an interesting variety of methods to cope. Saw many who wrapped extra insulation around the outside of their RVs, then held that in place with duct tape.
Covered canopy is a good idea, to protect the roof from the weight of the heavy snow that falls in coastal areas. The snow in our area is very light compared to that slick, wet stuff.
