What are the risks of the Lunar Rover?

If it broke down the astronauts would have had to walk back. Since one of the Rovers went over 17 miles, coming and going, this could mean quite a hike, around 8 miles or thereabouts (since the 17 miles was not in a straight line). The Rover had a separate motor for each wheel, so if one or even two conked out they could still have made it back.