The Mobile Base System is an aluminum structure mounted on the mobile transporter.  It serves as a storage location and a work platform for astronauts.  The MBS is equipped with four Power Data Grapple Fixtures and a Latching End Effector to hold payloads.  The MBS also provides a Common Attach System to accommodate payload  transportation and servicing, and provides structural and electrical interfaces to users.

Technical Details

Total Length	5.7 m x 4.5 m x 2.9 m
Mass (approx)	1,450Kg
Mass Handling/ Transportation Capacity	20,900Kg
Degrees of Freedom	Fixed
Peak Power (Operational)	825 Watts
Average Power (Keep alive)	365 Watts

The MBS was launched on STS-111, June 5, 2002.