2 minute pothole repair machine. What a cool idea!
This seemed like a nice idea to build. Also has some playability rather than just driving it along.
Here is an article about the real thing
I'm not completely happy with the way the wheels are fixed in place. But I couldn't figure how else to hold them there while having the arm moving right through where the axles would normally go. When you lift the truck up the wheels drop out but when it is sitting down the can roll normally...most of the time.