Rather than it folding, I'm pretty sure I can see some hinges and fold lines, I'm wondering about how much it actually telescopes. All of the views show it at the same/similar amount of extension, too long for stowage on top of the truck and not very far extended for Craning (I don't think this is a real word).
I'm sure it does telescope to a reasonable length for stowing on top of the truck but it would be nice to see, unless I missed that shot.