The importance of the handbrake

What happens when you want to unload a bulldozer and this operation is done by inexperienced people.

First mistake: The unloading was done on a steep road.
Mistake number 2. The truck’s hand brake was not on.

When the bulldozer was at the end of the trailer, due to its weight, the trailer lifted slightly so that the truck wheels were no longer on the asphalt.

You see the result.