brief description
NASA has developed some concepts and prototypes, further information on these systems can be found via the links below.
additional information
Lunar Surface Manipulation System (
https://www.nasa.gov/exploration/home/lsms.html) and
ATHLETE (
https://www.jpl.nasa.gov/video/details.php?id=617).
Two additional public papers on LSMS and ATHLETE:
Wilcox, Brian H. ATHLETE: A Limbed Vehicle for Solar System Exploration, IEEE Aerospace Conference; March 03, 2012 - March 12, 2012; Big Sky, MT; United States.
Jefferies, Sharon A., et al. Lunar Lander Offloading Operations Using a Heavy-Lift Lunar Surface Manipulator System. AIAA SPACE 2010 Conference and Exposition; August 31, 2010 - September 02, 2010; Anaheim, CA; United States.