I also own a W124 wagon. Possibly it's due to the roof rack. These wagons are design to haul stuff up top. As for the larder sway bar, maybe it's due to wagons weighing more than sedans.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member