V8 with level has no stabi???

Hello.

my V8 starts knocking slightly in the back when I drive over potholes. Well, I didn't think anything serious because it's just the stabilizers or suspensions.
But when I looked, I looked for the Stabi behind!?! Of course I immediately looked again in the Etka for where it is and how it is fixed. I saw that they don't make any difference whether level or not. all stated, even with the coupling rods that can suck out.
Now I'm really wondering if that's right with me.

Further question:
Does a V8 without a sunroof also have a crossbar in the middle?? On the front and on the back, yes, there is even seperat to buy but what about the B-pillar, is the roof also reinforced? The sky is too thick to feel.

Thank you for listening and your investigation.

Greetings,

Herbert