One tiller would prolly do the trick! Its sounds like an easy job after the tilling is done have your parnter bring back the tiller and you finish the job. Thats what I would do. It does seem like it you take you 8 hours. I done things like that before lunch.
'02 Ford F-250 5.4l8' unimount
Western Salt Spreader
Minnesota certified pesticide applicator
NOT MY PRESIDENT!