Originally Posted by
Ritterview
It is better that the load to the rear be suspended so to reduce the instability caused by the up-and-down movement of the stoker's mass.
Why don't all bikes have suspension posts to reduce instability?
If you suspend the stoker (or captain....) you will potentially affect power production/injury potential due to constantly changing seat to pedal distance.
My stoker test drove a suspension post and gave it big thumbs down (YMMV).
The only time I feel stoker movement is when she stands, but she is small (~100 pounds).
Not saying suspension posts don't have their place, but there are negatives to weigh.