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to prevent cars from passing beyond the rear edge of the trailer, and most also have side underride guards for the same reason. There are also other smaller differences with regards to kingpin depth, lighting, door locks, et cetera, though most purpose-built tractor trucks can carry most types of trailer regardless of which continent it was built on and the differences therein.
*Box or dry van trailers are the most common type of trailer in North America. They consist of a metal box on wheels with a pair of swing doors secured by espagnolette locks

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