Crayon Physics with Truck

This is a physics puzzles game.
The goal of the game is simple - to load all rocks on truck.
To do this, you have a truck, crayon and brains. Use them to perform the physics task.
Just draw your decision. Draw as well as you do it crayon.
Any design that you draw become physical objects that can interact to physical objects in the game.
There is no only one correct solution. Can you find the best?
Draw clamps, hooks and different physical designs.
Your brains are the main key in this game.
For each level there is a help, but it is only in extreme cases.
Try to find your own decision.
Show how clever you are.
Enjoy!