It probably is the accumulators. Harsh, stiff suspension is what my wagon was experiencing until I replaced the accumulators. I don't know how long they last, but if they have never been replaced you are for sure due. You could be risking blowing your rear shocks.

__________________
tgmiller77
1997 Land Rover Discovery 158,000
1995 E320 Wagon 132,000mi
1999 E320 Wagon 97,000mi