OK, I know the buggy leaf has its place and all, But I can't stand the racket and un predictability. And I saw one on my friends truck fail badly.
To each his own, But I like my setup tight and quiet to an extent...And as reliable as possible...Oh and its my D.D. too, and I love to haul a*s.
The double shackle seems like It would have the same problems, But I have not experienced one....
I would go to coil springs or something to gain mass flex...