If I were going to attempt such a thing, I'd have cam lobe-shaped "wheels" on it so the tractor was lifted (rabbits and all), moved some distance (determined by the shape of the wheel), and set down again. That way, the leading edge of the tractor isn't pushing the grass over.
Having said all that, if you're going to raise livestock, you
should be willing to tend to them every day in some fashion. Moving a tractor by hand is less than a minute's work once you're there to check
feed,
water, and health. The cost of moving the tractor automatically is pretty high. Of course, you have to be physically capable of moving the tractor; if that's an issue, automation might be
the answer.
Cheers.
J.D.