I suggest NOT living in an RV during the winter in New Hampshire. You will most likely need an RV with special "arctic insulation package" and learn various kinds of methods regarding water freezings (60 watt bulbs in the plumbing areas,electrically heated hose, for instance) and, many other things to preserve what you have not getting damaged.
If you MUST stay in N.H, I suggest you rent or lease or buy a house....or travel to Phoenix or south Florida (south of Orlando) to get into the warm tropics. Most RVs are not built to handle the extreme cold of places like New England.
G'luck!
just my 2 cents.