Nivomat shocks worn out?
 

My 2003 T&C Limited AWD (125K miles) with rear load leveling suspension has developed a very harsh ride over the past 20K or so. Most of the noise and harness seems to be coming from the rear. However, it doesn't feel floaty and does OK in a rebound test. My first thought is that the nivomat shocks are shot. Advice appreciated.