This is in parallel with my rating for Woodall's Western America Campground Directory.
You'll see these "guides" recommended in many camping and RV forums, and planning an extended trip, I bit, and it left a sour taste in my mouth.
The first 100+ pages of both books is dedicated to (a) advertising - lots of it, and (b) "One tank trips" mostly in the eastern U.S. If you're buying a guide specifically for the western or far-western U.S. why do you want information on pretty drives in New Hampshire? We didn't. And did I mention the advertisements? Let me mention them again: these are costly books to have this much advertising; with all the ads, they should be free.
Detailed information about campgrounds is limited to Woodall's selected campgrounds, which curiously enough, seem to also be Woodall's advertisers. All the thousands of other campgrounds have uselessly little information, in a yellow-pages format. If you're looking for smaller, quiet campgrounds, slightly off the beaten path - like we are - this is not the guide for you. If you're after a list of glitzy resort-like campgrounds, you might be more satisfied.
And about those "One Tank Trips"? We live in Arizona, and the trip they recommended for Arizona is Quartzite to Kingman. Really? Arizona is a scenic state, but Quratzite is butt-ugly and the drive from there to Kingman is both challenging in an RV or any sort, and not at all scenic or attractive. But Woodall's seems to have more sponsors in Quratzite and in Kingman than around the Grand Canyon or the Hoover or Glen Canyon dams. Go figure on how they selected that route for a "One Tank Trip".
Save your money. For most of us, these are garbage.
(Why 2 stars? They aren't a total rip-off, there is information in them.)