Received my Holmes 525 Wrecker operation instructions manual today. A little pricey, but here is my take;

A little short on how to operate the hoist. It assumes you know something about hoists, etc.
Great lube diagram and specifications.
Great diagrams for how to install winch on to a truck, which will come in handy.
Great diagrams on rigging with the twin booms and snatch blocks, etc. Very informative for those that haven't seen a twin boom in operation.

Worth the money,

BaconFarms


1948 GMC 2 Ton
1958 GMC 370-8
1965 GMC 5000
1970 Chevrolet C50