dssur
+1y
everyone knows how a leverage setup gives you more lift, the closer the force is to the fulcrum, the more lift at the end of the bar.
Well, why wouldnt it work that way with forces on the end of the bar? meaning a small movement at the axle end would mean a huge force change at the fulcrum.
What you have is a problem with the dynamics. The small movements of the axle are swinging into large forces at the bag. The bag, being a spring, starts to oscilate, and becaomes extreemly under damped (no shocks) and you swing out of control.
There is a reason people try not to exceed a 2:1 ratio with leverage setups (bag in the middle of the bar) You just found out why without asking.
Yes indeed the problem would still exist with a forward mounted setup. BUT
since the bar mounting would be closer to the center of the truck rather than out past the rear wheels, it would not swing into a 180. That is also the definition of a leverage setup, think of the fulcrum at the rear wheels and the force being applied at 1) the end of the frame 2) the middle of the frame.
So not only get shocks, not only move the bag mounts away from the fulcrum, but make it a froward setup while you are in there.