Type Recreation.gov into your Internet search engine. This pulls up the U.S. government's recreation service page, which you can use to browse for state RV sites.
Select your search criteria from the left-hand toolbar. Make sure to select "RV sites" under the heading "Looking for." Additionally, choose the state, ZIP code and dates and length of stay. Click "Search." When you press "Send," the website directs you to a list of campsites within your search region. By clicking on any of the sites, you are provided a camp description, directions, map and list of amenities.
Browse the various sites that match your criteria. When you choose the RV site at which you want to stay, click "Book Now" on the right side of the page. Select the dates of your stay and the desired site (based on the size and needs of your RV). Continue following instructions to checkout.
Buy a reputable RV travel guide for the state or area that you wish to visit. Examples of reputable guides include "Frommer's Exploring America by RV" and "Trailer Life RV Parks, Campgrounds and Services Directory" by Trailer Life. Use this guide to look for parks that interest you.
Search the website of any state or national parks or communities that you want to visit. Many times, the parks or towns list campgrounds on their websites.