Different Types of Tractor Trailers | Evan Transportation
https://www.evantransportation.com/blog/tractor-trailers/different-types-of-tractor-trailers/
WebJul 30, 2013 · Tractor trailers, also known as semi-trailers, move a whopping 68% of goods delivered in the U.S. More than 5.6 million are registered in the U.S, and there are 3.2 million truck drivers in the U.S, who collectively drive about 140 billion miles a year to get goods to their destinations.
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