Just watched an interesting way to unload a container.
The bed of the trailer started to tilt from the area of the drive wheels.
It continued to raise and the the axle underneath the bed of the trailer started to move toward the drive wheels allowing the trailer to achieve an angle sufficient for it to slide off. Once the rear axle had moved to its max position the next process was to slide the container to the tail of the bed. Then it was just a quick jerk and the container touched the pavement allowing the truck to pull slowly forward and subsequently dropping the whole container on the Sobey's parking lot. A little nudging out it back to the right spot.
As I was leaving they were unfolding the Fireworks Banners to hang on the side of the truck..
A neat and interesting process to get that container off the deck.