Crane lifts shipping container stuck to trailer - GIF

[Frank S]

Do you have a picture of how the corner locks work? I've never seen them up close.

I don't think I have any pictures of any on any trailer I've owned or worked on will have to dig into my photo's files to check
But here is a web picture of one. The ones I like are the retractable so when they are not needed they drop down flush with the trailer floor
This one is fixed non retractable the kind you would find on the specialty container chassis just give the lever a 90° turn the crown rotates and locks in the socket on the container

This one is a flush mount same principle but you push it up then the stub locks in place until the container is lowered over it then rotate the lever to lock it