If you google search for the powerliftingtowin review of the juggernaut method, you will get the basic outline of the program.
If you then google search for the juggernaut method strongman, you will see basically what is in the book for Strongman.
If you like that, then the book is probably worth it. That said, his latest book has a strongman/powerlifting program (similar to the cube) plus the juggernaut method in it.
Keep in mind, Chad used juggernaut to prep for his first (and second?) Powerlifting meet and not for his strongman comps.