I've got the W126 front LCA bushings already, but I'm wondering if the W126 trailing arm bushings/subframe bushings/diff mount will fit, and if they're any beefier than the W123 parts.

Houston has some amazingly atrocious potholes, and my explorations often take me onto rough or unpaved roads, so I'd like to toughen up my suspension as much as I can.

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RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)

I am assuming you want the parts for use on a W123?

Using the W126 Lower Control Arm Bushings is the only one I have read of that is kind of HD and they are listed in the parts catalog as for 15 inch rims or police car. I have not read of any other parts that were HD.

However, you need to go to somplace that has a genuing mercedes parts list to see those notations.

There is stronger coil springs available but don't have details. Someone like Deliveryvalve knows.

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84 300D, 82 Volvo 244Gl Diesel