BoredEngineer - Thanks, the “best-behaviour” link helped me improve things… slightly - but still no-where near an acceptable level.
articulations sound like they would be a working solution - but I’d be amazed if there is not already a way to do a similar thing with UE4!
I’ll make a new post more broadly about doing an axel for a rolling wheel with steering and suspension - still, if anyone has any more insight on how to make a series of constraints work in a decent manner - I’m all ears!