What is an ISO neck profile on a trailer?
An ISO neck refers to ISO 1726 which is a standard which more broadly covers dimensions, angles and gaps between a tractor and a trailer to ensure that there is no risk of fouling between the two.
ISO 1726 is not a legal requirement so it is possible to have both tractor units and trailers that do not comply. For instance, some urban trailers will have a "short" neck with a kingpin and landing legs that are closer the trailer bulkhead.
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