Here is a little crew!
These two models are very compact, so very simple technically.
The forklift:
The arm can be moved using a worm gear/8t system. The towballs are here to limit the movement of the system.
The fork moves when you turn the 12t gear. There is a pin with friction to keep it in position.
The truck:
It is even simpler than the forklift. It has a steering and the dropsides are openable.
If you want to build this MOC now, there is a LDD file on Rebrickable!