Having been surrounded by three of them on the M1 this morning, it set me wondering and now I just have to know!
How is the container fastened to the lorry?
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Twist locks on each corner, that lock the container to the trailer beam frames.
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And in case that wasn't clear;
There is a pin that comes up from the truck through a hole in a metal box at the corners and in the middle of the container. The hole is actually a slot and the pin has a bar on it so that once its through it twists and thus locks. Most of the stability comes from the sheer weight of the container.
A lot of smaller trucks have them as well, but because the load doesn't look like a container you don't realise. Look for long rectangular tubes down the side - these are actually the legs that drop down allowing the truck to drive out from under the box.
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