By utilizing Traxxas Stampede Tera 4.75'' RC truck tires, the Lynxmotion Aluminum A4WD1 Rover has excellent traction. There is plenty of room inside for additional electronics. You can add optional accessories, such as a Pan and Tilt Kit or a Gripper Kit. Autonomous operation can be achieved by adding a dual motor controller, microcontroller and sensors to the Lynxmotion Aluminum A4WD1 Rover.
The choice of electronics depends on your needs, if you want it to be remotely controlled or autonomous. The choice of controller is up to you. A microcontroller is suggested for autonomous control, while an R/C system is suggested for manual control.
Overall dimensions including wheels:
Assembly Guide: http://www.lynxmotion.com/images/html/build122.htm
Lynxmotion User and Assembly Guide: http://www.lynxmotion.com/s-1-information.aspx