Check sway bar mounts as the bar across will bang terribly when they are bad.

Rough ride is flat accumulators or binding struts, and I cannot imagine the struts binding.

Can you bounce the car by using a foot on the rear bumper, or do the tires just squish out with no suspension movement? If the suspension is rigid, there is something wrong with the accumulators, the fluid moves into them and displaces a rubber diaphram against nitrogen pressure. They fail when the nitrogen leaks out, and there is no suspension movement because the diaphram is up against the top of the sphere.

A loose sway bar will cause the link to be out of position, likely.

Low fluid or a bad pump will cause the rear to sag badly. Dead springs will cause a mushy ride, not a harsh one!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!