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The cranes in the Photos appear to have the roller chassis and I am trying to determine how this chassis works. Being self contained they can be moved on the truck bed from the front to the rear, But how are they attached to the bed because they can not be rigidly bolted.

Can some one explain how the crane is attached to the truck or trailer if it can roll down the bed? Does this make the crane removable?

I am interested in more information those cranes. I would be cool to have one that I could remove from the truck when I did not want or need it.