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Universal truck

This is my "carry anything*" vehicle. It uses a bunch of stuff I've learned:
- The center of mass should be near the center of "drag" (aka the center of wheels). Too far forward and you can't steer while going fast, and too far back and you spin out too easily.
- When making these kind of wheel assemblies that rotate back and forth, you want the hinge to be as low as possible so that when you run into an object, the front wheel will rotate up and back instead of down and back.
- You want the upper perimeter of the vehicle to overhang the lower perimeter so that if the vehicle ends up on its side, it'll naturally roll over to the wheels instead of the roof.
- If you put the wheels up against a solid object, it reduces the distance the built-in suspension can go, which stabilizes the vehicle when you're trying to move cargo.

Other than that, I've added a bunch of cosmetic items for fun, including a spoiler that actually keeps it from falling over sometimes. The pneumatic cylinders can be extended to right the vehicle, and can be kept extended to ensure it doesn't flip over. The wheels extend to give variable rocker freedom and massive clearance, while still fitting into the warehouses. The lid can be lifted to carry many crates of supplies, or lowered to lock apples and oranges in their crates.

* doesn't really work for bricks or dense matter, and a bit difficult for prisms