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I too feel they were over torqued. As stated by others, the only way to get the proper torque is with a manual torque wrench. They make a product called torque sticks that attach to an impact wrench (between the wrench and the socket) which work pretty well, and some shops swear by them, but they are only as good as the tech that's using them. If the impact wrench isn't set to it's highest setting and in good shape, the torque applied isn't enough. If they happen to pick up the wrong stick, it can be too much or not enough. We use them at our shop, but I check them against a torque wrench periodically, and my guys are well trained in the use of them. We do not use them on trailer wheels though, I prefer the accuracy of the hand held torque wrench.
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