I got some pictures of my wrecker setup, and it is in really rough shape. It looks like it has been involved in at least one catastrophic failure. I am just learning about wreckers so I may not be using the right terms for the right pieces or parts.
http://www.flickr.com/photos/donnoman/sets/72157625125368907/show/There are braces on both sides that are broken off, sheared at the welds. One of the wheels/gears that has been stripped. A chain is holding up the boom, I'm assuming its missing an assembly to directly mount the main pulley to the boom. The setup of the boom is weird in that the rear end of it is encroaching the area where the cable should be being spooled. It looks as though the boom may have been able to be extended at some point, but it's now welded so it can't. The cable is well rusted and fraying in places.
While I'd like to keep the truck as authentic as possible; this wrecker bed has definitely seen better days. It may be that I ultimately take this wrecker bed off and try to find another wrecker bed for it.
Do you recognize the setup?
Other Images of the wrecker:
http://www.flickr.com/photos/donnoman/collections/72157625095864205/