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It sounds like a problem with your computer or injection system. the computer controls the amount of fuel put in the cylinders when you step on the gas. But it sounds like your truck's computer is having problems controlling this and when you accelerate hard or are towing and step on the gas, the computer just pumps diesel into the cylinders which causes the rough running(i assume misfiring and what not) and the loss of power. But when your not towing or accelerating hard, you are better controlling the amount of fuel going into the cylinders so there arent any problems. Go back to the dealer and tell them there is a problem with the injection system and it adds too much fuel when you try to get a lot of power out of it.