I seen that out at Johnson Machinery a couple of years ago. Seems like someone thought it was a good idea. They also had a water wagon and a small beegee to pull with the 446 "prime mover"
I looked at the cost, and figured for the price, you could buy a used 613 and water truck, with enough left over to still buy a used backhoe. Then you would have all your bases covered with the proper machines, instead of this frankenscraper idea.