Interesting when you do a quick search on Broder's articles, the majority of them are related to the oil industry.
Bill Keller the former executive editor of NYT is the son of George Keller. George Keller was the last chairman of SoCal - Standard Oil Company of California, which later formed...
Not sure if you bought the headphones yet, but I would strongly suggest either one of these: Sony MDRR7506 - $88 on Amazon & Sony MDR-V55/BR DJ Style - $98.
The reviews speak for themselves...
I would think the dispatcher or whomever organizes the trailers would keep track of which trailer goes where. Time, Date + plate should be enough to trace I'd assume.