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Slate, a customizable EV pickup for $20k
(electrek.co)
This is a most excellent place for technology news and articles.
My understanding is that the current design is merely an evolution of regular human-controlled machines, and they still need to be able to operate w/ a human inside. Once you remove the human from the equation, the design space opens up quite a bit, and you optimize for different things. Since things would likely be battery powered, maybe you'd want more, smaller devices so they don't take as long to charge.
I don't know, I'm not a farmer. My point, however, is that once we trust machines to operate w/o humans in control, things are likely to change a lot.