Cat's 793 is one of the largest trucks in the world....with a 2400HP engine and a 250 ton box it uses a whopping 45 gallons of fuel an hour!!!
This one is on it's way to Fort MacMurray in northern Alberta Canada, there will be at least 4 more truck loads to complete the whole truck, axles, cab, box, tires etc. When complete it will stand 50 feet tall to the top of the box when raised and just over 30 feet wide.
One of these backed over a 24H grader last fall and snaped the grader in half.
You can see the size of a 24H in my 24H rebuild gallery......