Cool things with wheels since 2006
My guess is that he's managed to make some type of "rig" so he can pull them with his sitting mower and that enables him to cut a much wider swath of grass - which equals less time cutting the lawn - real ingenuity!
That's correct, redneck gang mower. I did similar a couple years back but only used 2 behind the rider, I was cutting 86" at a time, for cheap! I called the set up The Turf Terminator 8600.