I found this book quite useful when starting out, even for figuring out how to shop for what type of RV for what kind of use. A lot of buyers start out thinking "what fits what I want to spend" rather than "what fits how I want to use it." This book helps work past that.
I've also used it to plan some trips, along with another book by the same authors. Last RV trip we took before my wife died was a combination of Route 66 with Billy the Kid Meets E.T., and some other stuff we found along the way.
Tom Test
Itasca Spirit 29B