Trailer (vehicle)
United States
In the United States trailers ranging in size from single-axle dollies to 6-axle, 13-foot-6-inch (4.11 m) high, 53-foot (16.15 m) long semi-trailers are commonplace. The latter, when towed as part of a tractor-trailer or "18-wheeler", carries a large percentage of the freight that travels over land in North America.
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