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