I don't think John Deere was ever in the silo business, maybe someone will prove me wrong. But, what I have seen are silo blowers. To fill the silo, with silage/chopped corn from the top, silo blowers were used. These were PTO driven blowers, fill the back of a pickup bed in size. Usually on steel wheels to be moved from one silo to another. Had steel tubing coming out the top, with a hopper on the side the silage was shoveled into. They had the power to blow heavy wet chopped silage straight up 75-100 feet.