YouTube user hexdude24 owns a truck. The reverse gear in his transmission went out. He can't afford to fix it. In the meantime, he's using this device that he made. It slips under his rear wheels. As he drives forward, it pulls his truck backward.
Forgive me, readers: Alex hired me for my looks, not my brains. How does this system work? I'm struggling to understand it.
-via 22 Words
The tires no longer touch the ground. Instead by going forward the tires drive the cylinders in reverse and the reversing cylinders are in contact with the ground.