Meet the HD2 Treaded ATR Tank Robot: a rugged platform capable of carrying heavy payloads. Its wheels are driven by IG52 gear motors. There is also a 10000 mAh battery . As this video shows, the HD2 robot can take a person up the stairs when configure with the right parts.
HD2 Stair Surfing - SuperDroid Robots HD2 Platform
You can buy the robot as an unassembled kit. More info is available here.
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