I've owned most oleopnumaticaly-sprung Citroens over the years, in terms of pure ride comfort the order is (IMHO)...
1) DS - although the DS is over-soft and lollopy at today's road speeds.
2) CX - the most comfortable real world Citroen ever and perhaps the best car ever over speedhumps.
3) XM - (avoid MK1s) My Mk2 was faultless - much better handling than the CX but almost as comfy.
4) C6 - although strangely you can feel small ripply undulations at low speed - supreme on the motorway.
5) C5 (Mk2), C5 (Mk3), C5 (Mk1) obviously not the steel sprung ones which do admittedly ride nicely for conventional cars. The rebound damping of the Mk1s is badly judged making it crashy off speed humps if you take them too fast, but otherwise comfy.
6) Xantia
7) GS/GSA
8) BX
What's your budget? The X300-X308 Jag would be high up the list but might be a bit low for someone with a bad back.
The previous air-sprung Jeep Grand Cherokee is pretty comfy over the bumps.
The current steel-sprung citroen C3 Picasso rides surprisingly well, is very easy to get in and out of for people with limited mobility and is cheap to run.
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