not really...i tried a lot with all this params and alltime it fall back to shaking sometimes faster, sometimes slower... but everytime came the time it shaked...
...it was hard for finding it out, but i found a solution with my own low poly car (cube and cylinder) and in this way i played allso with the collision box...now, try this:
the collision box of the car must be bigger like the car including the wheels (with steered whells), and on the same hight, like the wheels...hmm, hard to explain:
only change the collision box in this way you see on my pics and try it out...
for real collision with the world i actually try to define a second mesh and collission box, parented on car for better colliding.
wtf, i hope u understand my bad english xD
Neo