Lets go for a ride

Its amazing what you can learn from some well placed cameras
If you look close the rear section is bowing excessive at that point. that was my theory as to why they are clamped there.

Makes me wonder if a caltrac and a like setup don't try to make a u/ bend in the bow of the back half of the spring.
The front is basically locked solid........... but then again that's what the rear shackle is for. just thinking/ typing out loud.