Addition of massive industrial excavators, like in the photo in anex (Bagger 293).
It would be a late game alternative to excavators for large terraforming projects, being more suitable for moving stone and dirt.
They could fill a mega hauler in a single step, or could be in some way connected directly to a building, like the new ore separator building.
Being too big for the vehicle depot, it could be assembled like a building, having limited mobility, like rocket mover vehicles.
