You DO NOT want to live in ANY RV during the New Jersey winter. Airstreams have about 1-inch of glass fiber insulation and a night at 40-degrees burns about 10 gallons of propane. Every year I spend 4 nights in October in Northern Virginia in my AS and burn 40 gallons of propane for heat.
The heater can be noisy. Winter and travel trailers don't mix. Even in a park you'll not get enough electric heat to keep warm and the fees will be enormous just for one week. I'd draw the "south of. . ." line about 60 miles below Jacksonville, FLA as I know the night January weather in Jacksonville well.
