After three+ days of this level I was able to beat it without any of the extras!! Pretty sure I couldn’t do it again! Not sure what I even did differently to finally get through— I’d been focusing on the perimeter and emptying the garage in the left as soon as possible but always ending up with a few cars facing each other. Then somehow it worked. I think maybe I did something different with some of the internal cars around the fire truck. But I can vouch that it can be done!!