Not an owner driver`s trailer!
Tipping a load a la Heath Robinson.
Edit-
Actually, I should apologise to the late HR. He wouldn`t have come up with such an idea.
Americans 
Unorthodox but effective. 
Canadian handbrake testing
youtube.com/watch?v=TO_7PjOIS9Y
Franglais:
Canadian handbrake testing
youtube.com/watch?v=TO_7PjOIS9Y
Used to be one like that at Bury St. Edmunds beet factory. It was difficult not spilling your coffee on the way up!
Beau Nydel:
Franglais:
Canadian handbrake testing
youtube.com/watch?v=TO_7PjOIS9YUsed to be one like that at Bury St. Edmunds beet factory. It was difficult not spilling your coffee on the way up!
The original powered reclining seat?