This is the SuperDroid Robots HK1500: an autonomous heavy duty robot that can be programmed to carry heavy loads around. The HK1500 has max payload capacity of 200lbs. It has max speed of 3 mph. This robot has 75RPM motors and 13″ wheels.
This robot uses 6 x motors. It uses a RoboteQ 2x150A motor controller. You can find out more about the robot here.