See the rover on the edge? Noooooooo! Don't do it! You will snap your back for sure.
Rover reaches three and a half years in it's 90-day mission to Mars. Those guys have been running longer than expected. Soon one will try to drive into the Victoria crater. Examination of the exposed layers on the wall may give insight to the history of Mars.
http://www.nasa.gov/mission_pages/mer/