Robots have always fueled the imagination. Most of the ones featured in the movies have some type of humanoid features, such as a 2 leg, 2 arm body. They look good in the movies but don't work so well in the untamed environment of outdoors, the desert or Mars.
Here is one that NASA is working on that has 6 legs with a wheels for feet. It can really Walk and Roll. It's movement is more like a crab that can rollerskate.
This is the base section which you can add extra modules to for specific tasks.