Here is an autonomous robotic slope mower that can mow steep surfaces, such as areas around rivers, highways, and hills. It is smart enough to perceive its surrounding and avoid obstacles. As the below video shows, this robot can come handy for solar farm applications.
The TREX 44 has a 19HP engine with electric start. It has 2 x 22″ cutting blades. It also has 6-inch rugged rubber tracks. You can find out more about it here.