I'd forget about a paper book and use something like Allstays Camping & RV app. (it's the best, IMO). It's not perfect, of course, but nothing ever is. Only 10 bucks and it is updated several times a year.
It's meant for a smart phone but I use it on an android tablet since I don't have a "smart" phone. Anyway .... lists thousands of camps, gas stations, RV dealers and repair shops, dump stations, etc. all over the country. Has links to RV campsite review websites so you can see what others think of a particular site. You can search for privates campgrounds, BLM ones, state or county campgrounds, yada yada yada.
If you are using it on a smart phone, you can even call a campsite from the app while you're traveling to make a reservation or ask a question.
I don't work for these people but have been using the app for several years and believe me .... it beats lugging a five pound, 3" thick book around that needs to be re-purchased every few years.
Allstays Camp and RV | RV Parks Campgrounds App