I was in a rush to tell you my farm story. It's actually a "New Holland Bale Wagon."
https://www.youtube.com/watch?v=hjRfWGhYaKI
My father had a pull-type wagon. Not as nimble as this self-propelled unit.
It seems you missed the bale wagon revolution, which puts you at 72 or a little older. Not too many farm kids my age had to endure stacking small square bales by hand.
Small squares went out of style about 30 years ago. But they have made a comeback, with farm equipment manufacturers bringing back their small square lines.