Most of the combines around here are fairly small. The farms tend to be broken up into 40-60 acre fields by streams and hills. But, I remember harvest time in northern Illinois and the combines lumbering through the fields three or four at a time.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk