Robomowers have come a long way over the years. You can use them to mow your lawn without having to break a sweat. The RC Lawn Mower Chassis Upfit Kit lets you turn your 21 inch lawnmower into a robot. It has a steel frame chassis, 13″ pneumatic drive wheels and 6″ pneumatic caster wheels.
The max speed is about 5mph. It has payload capacity of 100lbs. The robot is driven by heavy duty wheelchair motors.