Gtractor you rarely see them that well spaced. When I was on the harvest we had aerial pics taken of six combines one time for company advertising. It was very difficult to keep them all spaced the same. Then one of them broke down in the middle of the shoot.
When we were running hard I sometimes shook my head at the young combine operators who thought they had to run right behind the machine in front of them. For one thing, in heavy dust it's not safe, but it didn't seem to occur to them that they were cleaning filters more often than the other combiners were. Duh! Saved a lot of time following that close huh! Jim