Nothing now with my home made caltrac, and not so much then as more of a spring bending below front shackle issue. I just thought maybe that would take some of the hit out on the intial and then some out on braking but....

...It looks like what I really need to do is build a spring pack with a couple of spring extending clear to front shackle and tailor the height and rate to something softer.

Was just looking for some real world experience with them.