I prefer the more structured approach to these kind of games over the sandbox, so here's the vehicle I made to clear the second challenge level. Getting the rear wheels to turn opposite to the front wasn't too hard, but it was satisfying when it worked and gave me a better turn radius.
I may not be the new Adrian Newey, but I'm sure able to draw some interesting lines if I may say so.
Had to play around quite a lot to get enough clearance, as I was going for a high downforce chassis. Still need some work on the current setup as it tends to be little bit oversteery, but happy on the overal performance ;-).
Had to spend some time getting used to the AI, but was able to quickly learn and apply it afterwards. Ended up spending a lot more time in the game than I originally intended, and that's a good thing!
I tried to make it look like the tanks from the Phantom Menace. Didn't really work super well but it drives great! I would recommend changing the building from fps controls to controls more like a cad program. Better distinction between pan and rotate and zoom. But it's a fun little building game and I look forward to diving in more when I have more time!