I have seen posts asking for information on CG's in certain areas. I use a program called Microsoft Streets & Trips, except when I'm on the iMac.
In each case, you can also use
Microsoft Live Maps
When you click on the link, type in the word "campgrounds," without the quotes in the Live Search block. You will be able to zoom in. Once the campgrounds pop up, you can drag the map along your route, or in a area, and the center of the screen will re-populate with campgrounds.
It is not all inclusive, but is just another way to find a campground on your route.
Don't forget to try alternative words, like RV Park, or Camping. You can even do restaurants, and you can be specific, like Italian, or Mexican. You can even misspell it sometimes. It all up to your imagination as to what you want to search for. Try "camping world," without the quotes. It just might be your next stop.
Cheers!