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Assuming you're referring to US regulations, there isn't actually any law specifying what the limit is on this. 36" inches of gap between the front and the kingpin is common on van trailer and some flatbeds. The only regulation I can think of offhand here isn't a federal one, but for the state of Maine, which specifies a 3-1/2 foot max gap between the front of the trailer and the kingpin.

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Q: How far is it from the kingpin to the front of the semi trailer?
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