Padlin mentioned in post #17
that the rockers in the 5.0 TA suspension are Dexter's E-Z Flex
. Instead of just being rigid, these are two-part devices with rubber between the parts. That doesn't mean the there is any rubber damping of the motions of the steel springs, or even damping of the rocking between the two axles.
I'm sure the E-Z Flex soften the ride, since they add springs in series (when two springs are placed in series, the combination is softer than either spring would be by itself). The additional motion allowed by the E-Z Flex is damped by the rubber, but the motion of the leaf springs is not
I think that the inclusion of E-Z Flex is a nice touch; I don't know if it was included from the first 5.0 TA.