This is before actually hitting the road, but this book really helped with planning the trails I want to hit when in Moab in August! Will update after the trip.
After using the internet as a trail guide planner for an upcoming Moab Jeeping trip my wife and I decided we should probably grab a book that would help us keep track of the trails and any points of interest while out and about.
We settled upon this book and used it for our most recent trip and it was immensely helpful. The trail descriptions gave us an idea of what we could expect and the GPS coordinates provided to mark portions of the trail were really helpful.
A great set of maps and writeups of 4wd routes near Moab, ranging from stuff a high-clearance passengar car could survive, to stuff that no stock vehicle could cross (including some terrifying pictures.) A lot of material covered in here, with a strongly GPS-centric set of guides.