I was disappointed when I first saw the theme because it was the one I put last. In a lot of ways that really helped though because all the cool big ideas that I had looking at the others went out the window for something that I could actually conceivably finish this time around. I can see why its done this way now.
I have gone with a version of Snake with a truck and container trailers. I don't normally use built in Unity physics constructs like wheel colliders and hinge joints because they tend to break but this time I decided any weird nonsense was a feature not a bug. Here is the progress I have made so far, visuals are borrowed until I get to making the art after I finish the coding. Funky physics included.