Meet the DashGo D1-50: a mobile robot with intelligent navigation that can handle 50kg of load. It has max speed of 0.8 m/s with 6 hour battery life time. It uses ultrasonic sensors to stay out of trouble. This mobile robot is ready for ROS.
This robot comes with USB and Bluetooth connectivity. It has a modular design, so you can extend its capabilities to match your project requirements.