im looking at a 2005 c6500 chevy dump truck with a 200hp 7.8L I-6 duramax engine and allison auto. does anyone have this engine in a truck? if so what do you think of it? i want a truck that can haul a good size load of dirt in it and pull about 20,000 lbs i just dont think thats enough engine to handle what i want it to do. any thoughts?