Those round bales are not just sitting waiting to be collected, the reason farmers switched from square to round was so they could leave them in the field. Rain/snow will only penetrates the top 10% and runs off then so you save labor. Then they came out with wrappers that pick them up and wrap them in plastic so you can save that 10% and still leave them lay in the field.
They have different sized balers, I've never seen ones that were 1200lbs, can't have them quite that large in hilly areas, they are tied with baler twine and I can roll them myself and a couple men can tip them on their side.