Many are retired but a large group also work. If you have ever been to a tourist town you'll be suprised to learn that many of the folks operating the stores are full time RV'ers. They take the work for a few months and then as the towns start to shut down they move on. Many of the northern towns are open for 5 months or so of the year and mostly shut down the rest. They oppisite is true of many southern areas which open through the winter and close in the summer.
People go where the weather is good when they want to go on vacation.
The only time you want to see 10 feet of snow on vaction is when your skiing and yes, Many fulltimers work at the ski resorts. No, but you get enough to eat, fill your gas tanks, see the sites and buy new clothing as need. Many places offer RV hookups to seasonal workers and other perks. Ski resorts often offer free lift tickets. Now we are not in the poor house.