But if the accumulators were bad, wouldn't the right height stay normal, but the ride would be harsh? Currently, the ride is rather harsh over larger bumps, and it makes a THUMP sound every time I go over a medium to big sized bump. My SEC does the same thing, and the rear ride feels harsh, but the ride height is totally normal. :\

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles