One thing you will want to do FOR SURE is to put in a pyrometer, because if you try to get much more power out of that Duramax the EGT WILL go up. How much it goes up is what you(or your wife) want to monitor. I myself would not try for much more power pulling that kind of load. In MY opinion, a heavier truck (like a 6500 w/ a CAT 250HP engine and gobs of torque) would have been the right choice for the trailer in question.
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