Mining trucks that are used for the extraction of gold, copper or iron in large mines around the world. 

I Operate Komatsu 980E and Cat 797F at Work. Nice to know where I rank in terms of the largest. The load capacity is higher than indicated on this video. We carry loads up to 420MT  The sheer size of these monsters just blows my mind. 4000hp engines, 8 metres tall,  almost 20 metres in length and can carry up to 450 tons. The tyres on that Belaz at No.1 are 4 metres tall. Think about those stats for a minute. More than twice the height of most professional basketball players. The tyres.  Most of us that are viewing this Video will never stand along side one of these Monster Trucks to get a better impression how Large they really are.The Mechanics that repair these vehicles have to be specially trained, you would have to have hydrolic or mechanical hoists to move the parts around and work off scaffolding, amazing.  I find hard to believe that the cat 797F placed 3rd. It should be number1. It is used in mining throughout the world!  If we would compare loading capacities vs truckweight...horsepower and economy...and so on....no truck is as efficient as the mighty Liebherr