You want to camp at the beach? You might need to reserve a space a year in advance. Same goes for some mountain and lake campgrounds. The RV population has gained enough critical mass that you can expect the best places to be full at the last minute, so plan your trip the way you would plan your daughter's wedding.
Like a wedding, it pays to check the cost of everything -- particularly the cost of staying at each RV park. Call every park before you leave to make sure it has the amenities you want. Some parks are actual resorts with hot tubs, showers, fitness centers and regulation-size bocce ball courts. At parks with lots of amenities, rent can exceed $70 per day -- or $600 per month -- in peak season. Also, some of these parks don't allow children [source: New RVer].
If you're the sort of person who sticks to a plan, leave a copy of that plan with friends or family so they'll have a good idea of where you are in case something goes wrong. If you want to start each day with a new destination, consider taking along a GPS that will transmit your location and allow friends or family to check where you are on a Web site every day.