The lunar rover, only wheeled vehicle off the planet

Above image via: http://www.greyhandgang.com/

there were actually 3 deployed: http://luminosis.blogspot.com/2009/07/for-sale-one-lunar-rover.html
Above image via: http://www.solarviews.com/raw/apo/as17-147-22526.jpg

Above image via: http://upload.wikimedia.org/wikipedia/commons/e/ed/Apollo15LunarRover.jpg

Below inage via: http://apolloanomalies.com/images/ALSJ/AS17-137-20979HR.jpg

They are still working on the next generaton of lunar rover tires: http://www.crunchgear.com/2009/08/06/goodyear-and-nasa-develop-the-next-gen-lunar-rover-tire-its-springy/

I don't consider the toys on mars to be vehicles, since they have no ability to transport people