Here is an open source robot platform that can move on any surface indoors and outside. It can achieve a max speed of 8mph and has a range of 8 miles. It also has 180lbs payload capacity. The battery life lasts up to 5 hours.
The Open Rover Robot 2WD bundle has a SDK for motor control and data feedback. The Pro Edition has an Intel Atom processor, VGA camera, speaker, microphone, and LEDs for a variety of applications.