Reddit mentions of Fodor's The Complete Guide to the National Parks of the West (Full-color Travel Guide)

You're going to want an America the Beautiful Pass. $80 for unlimited national park admissions for one car for one year. Most parks are around $20. I also recommend getting one of the National Parks of the West guidebooks so you can link them all together and what-not. I've been to all the parks in a previous version of this book http://www.amazon.com/Fodors-Complete-National-Full-color-Travel/dp/0307928462/ref=dp_ob_image_bk

Linking national parks is the classic, American way to road trip. Enjoy yourself. I've been all over the world but my favorite trip was spending a few months living in my pickup in the parks.

Finding camping in the parks will be very, very difficult. Some parks are full months in advance. They may have a first-come, first-serve area but you will ABSOLUTELY need to be there at 8am. If you sleep in the car, you will get a hefty fine. Plan ahead. Even camping outside the park in a private campground will be difficult to find and frequently fully booked. Realize that "outside" the park can be more than two hour's drive easy. Can really put a dent in your in-park time. Get a National Parks of the West book. Super, super helpful. Will outline all the campsites and outside park camping and hotel/hostel options and everything you need to know like hours, etc. I used Fodor's but they're all probably pretty similar.

http://www.amazon.com/Fodors-Complete-National-Full-color-Travel/dp/0307928462

I've been to all the national parks. Yes, all of them. Have fun!