One of the things to look for that is unique to a wrecker is the accessories that are supplied with the wrecker. Does it have the four snatch blocks, the tow bar, the wiffle tree, the three sets of chains, the tire chains, and many more items that could add up to a lot of money if you have to buy them in order to make your wrecker complete. All of the items that origionally came with it are listed in the TM. Other than these items, it's just like any other used vehicle. Make sure everything works, if possible. If not possible, keep your fingers crossed.