And while I like electronics, I also like pneumatic / hydraulic controls systems, that over the last ~100 years have reached a really high level of sophistication.
So height control could be maintained by a valve like this:
..and I imagine, though I haven't done it, that an rpm-based pressure (ie a pump) could operate a speed-controlled lowering (a bit like the speed input in an old auto trans).
My old
W123 Mercedes has a hydraulic/nitrogen self-levelling system at the back that works exceptionally well.
And 1950s / 1960s Citroen are still state of the art for oil/nitrogen springing and self-levelling - although I don't think any lowered themselves at speed.