Ok, this would be under mechanics so it would take a while to get.
It would be a lift-able object (obviously) require whatever mats the devs see fit, and it will flatten a 2x2 area and displace the dirt into a collectables area. similar to the stamp mill and what not. It'll displace 4 full piles of dirt so you can drop the dirt onto a sled and carry it off.
It would take several (10ish) minutes to accomplish this 2x2 area but it is obviously doing it for you. Freeing you up to forage or whatever. Be nice to have the mats cheap enough to be able to easily make 2/3 of these reasonably. That way you can just make trips dumping dirt, move the machine, and move on to the next one. Rinse, repeat.