How do I find places to stay?
#1. The Next Exit (a book) because I'm a "freddy" when traveling, I choose to spend two nights "fredding" (as in Freddy the Freeloader, a character the late comedian Red Skelton developed), which I'm now calling "overnight parking" because some snooty RVers think overnight parking is freeloading and I think it's funny, in a Sam's Club or Cracker Barrel parking lot before spending the third night in a campground with hookups. Since I run US & State Highways that cross over interstates, I use the Next Exit book to see what's at the exit I cross over at as well as the next exit in each direction on the interstate.
#2. My Maps (Google.com/maps) I have been using My Maps on Google to keep maps of free and cheap campgrounds and overnight parking places by state. I just add or delete places as I come across the info. It keeps it all in one spot and some of the info I have never found on a review website. Since it's all private and I don't share it with anyone, I don't have to worry about insulting anyone by the places I have on it. It's not hard to do if you simply start with areas you travel in and to and just keep adding to it about once a month or as you find a mention of a place (after researching to find the contact info and correct GPS). Some of the places I have listed, I've known about for a few decades. But they are nowhere that I have found on the internet or only listed in one place. But they are still there and available to use.
#3. freecampsites.net lists a lot of public (some free - more "fredding") parks. Hookups range from full to none.
#4. rvparky.com also lists some overnight parking places and free public parks (more freeloaders than just me I guess) as well as public fee-based parks but leans more heavily towards private parks.
#5. campendium.com is similar to rvparky, just with a few different reviewers... sometimes.
I also check Passport America's website too (50% off).
The types of campgrounds and/or RV parks that you prefer to stay at will determine which websites you will get the most out of. I'm not interested in paying for something that I am not using. I do care if the hookups at the site are good and if there is a good place to walk the dog, which is what reading various review sites helps me to figure out. Otherwise I carry my own bathrooms, laundry facilites and wifi hotspot. And if I'm out of range for my wifi provider for a night or two, I have a hefty stash of DVDs and Blu-ray movies.