Meet the Robotnik SUMMIT-XL robot: an indoor and outdoor robot with 10hour autonomy and 65kg of payload. It can navigate autonomously but can also teleoperate it. This robot uses the ROS open architecture. It has 4 x 500w brushless servomotors and max speed of 3m/s.
You can enhance the robot with lasers, GPS, cameras, and other sensors. The above video shows it in action.