Drop shackles are great for flex on a ramp - but are really less than desirable in real offraod application IMHO.
For example if you are climbing something steep and loose and start to get axle hoop - these only make it much worse. Meaning less traction and increased chance of binding within the pinion uni etc.
Anyhow I thinks they are best left for ramp queens.
However I do have a set in stock if someone does want some.