Meet the RB- SHERPA: a smart mobile robot for indoor and outdoor tasks that can follow a human operator autonomously. It uses steerable motorwheels, featuring an open source, modular design. The robot has a max payload capacity of 100kg. It can go as fast as 3 m/s.
RB-SHERPA runs for 10 hours on battery. It is based on ROS and has WiFi. The above video shows this robotic platform in action.