MacroSwiss's Spybot 4WD weighs only 6kg (13 lbs) and can go anywhere thanks to its weird "Flapper Wheels". The spokes-like wheels allow it to climb 45 degree slopes, go down stairs, and be tossed (by explosives?) up to 30 feet.
The Spybot can even go through water with its paddle-like wheels, and can handle more payload than the Spybot MK II. Using this against human enemies is great, and its spy capabilities will give its owners a one-up on their opponents. However, in the impending Human-Robot Wars, there's no telling where this guy's loyalties will lie.