This truck has 3 functions powered by 1 L motor. They are enable using "inverted gearboxes", you have just to change the position of the switch to change the sense of the functions.
These functions are:
- The outriggers. They are very powerful, they can lift the truck: the wheels don't touch the floor anymore.
- The arm (up/down)
- The rotation of the arm (360°)
And there are 2 manual functions:
- The steering (of course)
- The extension of the arm
This model is very playable. So, support it if you want to see it in the LEGO shops! You can already build it with the instructions on Rebrickable.
https://www.youtube.com/watch?v=U9jnEuAjYDk
If you want more information, you can see the topic on Eurobricks.