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What is this black round thing on the roof of this transit company van? It was spinning fast. : r/whatisthisthing
![What is this round spinning thing on the back of a utility truck? It only spun when the van was moving. : r/whatisthisthing What is this round spinning thing on the back of a utility truck? It only spun when the van was moving. : r/whatisthisthing](https://preview.redd.it/px9ajr2h56b11.jpg?auto=webp&s=21022dc84fc649b5e700df7aa9bbc909ce16e902)
What is this round spinning thing on the back of a utility truck? It only spun when the van was moving. : r/whatisthisthing
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WHAT IS THAT SPINNING THING ON TOP OF THE NEW AMAZON PRIME STEP VAN/BOX TRUCK DELIVERY VEHICLE? - YouTube
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