I have traveled to all the states in the lower 48 since 2007. What helps me find a place to stay is
RV Park Reviews... It may come up a bit slow at times but be patient. A lot of people use it.
I know my destination and I figure out how far I want to travel in a day then look for campgrounds in and around the area. First I look for COE parks which I prefer. RV Park Reviews has a lot of information about a lot of parks and the information is from us that use the park. You get some good reviews, meaning helpful, and some reviews that don't help at all. Again, these reviews are by people that stay at the parks. They also have a forum where you can visit and ask questions.
When I find a park I like I copy the Lat & Long and go to Google Earth to have a satellite view of the park if it is not covered by trees. But I can get a good location to the entrance.
I use Garmin's Basecamp to plot the entrance . Check it again with Google Earth. If it looks good I upload the locations to my RV760.
FWIW
BC