The house is starting up the driveway right here. The ground has been thoroughly packed by a sheep's foot.

The yellow Stieger behind the house is for extra pushing power. If you notice the last dollies on this side, you'll see how they oscillate while jumping the curb.

You'll also notice that there's a green Stieger out front for pulling also. The Stieger may not have been necessary, but eliminates the possibility of tearing up the drive train in the truck. Sometimes it happens that the truck can't get enough traction and needs some help with the pull.