Mate, Ive never even sat on one let alone driven one so I dont know or wont argue one way or another but the way I see it, RD decks dont rely on vacuum or need to send a lot of clipping out a relatively small hole. Cut n drop like a bush hog. Sure, some gets "thrown" but but its not like it get dispursed across a few meters.
That said, the little diesel isnt loving it...http://youtu.be/Tpt5EgWJx0w
Likes this a little more... http://youtu.be/9fuXz0vMB0Q