The Harvest
One of the most important times of the year for an interplanetary farmer. And this farmer, well, he's not taking any chances. His fields are guarded with D.O.C Units, short for Defense Onslaught Construct.
They're built to be very swift and have no issues moving about in various terrains. The D.O.C units can be piloted which makes for a nice and safe way of transportation. They can also be unmanned, left to roam the fields.
You would have to be one crazy individual to try and steal from here. But in space... crazy is never in short supply.