"likely much more secure (being a closed box in the back)"
The moving trucks I've used are not very solid at all in the back. Googling, it appears that even larger trucks are made with a box that is mainly 1 mm thick aluminum (and that is claimed to be "above industry standards).
The moving trucks I've used are not very solid at all in the back. Googling, it appears that even larger trucks are made with a box that is mainly 1 mm thick aluminum (and that is claimed to be "above industry standards).