Trailer maker Utility targeted in ransomware attack Company discloses ‘cyber event’ after hackers leak employee data Utility Trailer Manufacturing is one of the largest trailer makers in the U.S. (Photo: Jim Allen/FreightWaves) Utility Trailer Manufacturing, one of the largest U.S. producers of trailers for the trucking industry, was targeted in an apparent ransomware attack that exposed personal information of numerous employees. The California-based company told FreightWaves that it had “suffered a cyber event” that disrupted some systems temporarily. The company disclosed the incident after the Clop ransomware gang leaked over 5 gigabytes of data to the dark web this week.