Big, off-road trucks are already in many ways toys for adults. The Toyota Hilux Tonka Concept takes this idea literally. Inspired by the Tonka trucks of our youth, it's decked out in a branded black-and-yellow livery, with a 2.8-litre four cylinder turbo-diesel engine under the hood. An increased ride height offers extra ground clearance, and the heavy-duty suspension handles harsh terrain with aplomb. It also has off-road LED lighting, a tubular frame in the bed to hold gear like fuel cans, a fire extinguisher, an ax, and a shovel, and 35-inch tires.