We went about fulltiming just a bit differently than most, and some think we don't really qualify as "fulltimers". When we retired, my wife and I started on a plan to remodel our small lakeside vacation cottage in upstate NY to make it year-round livable so it could serve as our "back-up plan" when we hit the road. Our two daughters and their families live in the area and use the cottage frequently for swimming, boating, etc, and the cottage has been in our family since 1947, so there was no thought of selling it. We also installed a full hookup RV pad there, and by 2010 we had sold our large home and moved into our motorhome year round. We do spend from a few weeks to a couple of months at the cottage spread throughout the year to take care of routine medical appointments and visit family, but continue to live in the motorhome when we're there. The cottage only costs a couple of thousand a year for taxes and insurance, and our daughters do most of the lawn care, etc. Like Joel, we have ~50,000 miles behind us now with no plans to hang up the keys yet.
We typically winter in southern Georgia and Florida, favoring state and federal parks for the most part. Summers, we tend to be in the Michigan, Ontario, and western/northern NY areas, with forays into New England at times. In between, we favor North Carolina, Tennessee, and Virginia, although we have traveled west as far west as Arizona at times. As Joel said, there's lots more to see...