Of course you could, that's why you don't skimp on those things. You can get by with a crappy interior, but things like wheels/tires/transmission/engine are high priority. That's my whole point here, it doesn't look like the wheels were over engineered enough, but I'm not a rocket scientist.
That wasn't clear from your original comment though. In case of the rover, other important things include comms/nav, movement controller, power source, and sensors.
