ROEQ is one company making tooling for mobile robots, specifically MiR platforms such as the MiR500.
Just as an articulated arm robot is useless without end-of-arm tooling such as a gripper, mobile robot platforms such as the MiR500 are useless for many applications without the appropriate tooling. In this video, Robotic Equipment (RO EQ) shows us a roller platform for the MiR500 robot.
Check out this video to learn more: