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Today we're going to be taking a look at the Hopkins Tow Doctor trailer end test unit, part number HM50928. This Hopkins Tow Doctor allows one person to check their trailer wiring and make sure all their functions are working correctly. It's going to come with adapters to work with your seven-way, your four-pole flat, and your six round. It's got your right turn brake, your left turn brake, your… see more >
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