ruthiebaby,
Pop up campers are great and you will "survive", but the question is how comfortable you will be...and how much money you will spend to make it "comfortable enough"? And for only a few nights a year, I suspect you would be further ahead to just get a motel.
Get a pop up (if that what interests you) for spring, summer and fall trips as you'll have a ball with it. But if the need is truly winter (i.e.; temps in the teens or lower), then I wouldn't waste my money.
Just my two cents worth (and I know two cents doesn't buy much anymore).
Steve