The grabbing mechanism proper is M4 bolts turned down to a point on the ends. All of my containers have a standardized spacing for the top holes. Trying to make the pins motorized would have made an already complex mechanism excessively so, and reduced strength.
I've found it easier to get one side lined up and then combine shifting sideways with closing the pins to grab the load.
Once loaded, it can be lifted and moved easy peasy.
Same holds true for the smaller sized containers
