LB, the shocks and the bar limit travel. The Floats I have installed give an extra inch of travel over the stock Kayabas. At full droop with the softness nut on full soft, the shocks top out and nut hits the draw bar. With longer shocks, the nut would hit the drawbar and attempt to tilt the front of rails down (until the limter straps come into play) which as we know would be quite bad. A longer bar and shocks could give more droop, and more potential softness.
I'm curious how a damper/shock would help or hurt the coupling. I asked some time ago about the X skid on the Hawk and why the 600 and up no longer uses the drawbar and has replaced it with a shock, but have not found the post with the replies explaining it and why it doesn't work for regular sleds. I would think controling the rate of coupling, along with when it happens, would have not benefit... but I could be wrong.