No complaints here, have pulled over my max and no running short on power. As I pull our fifth wheel if I need more power simply drop a gear. I have pulled both with a cummins and duramax prior and stick with the gas job. Very few complaints about this engine ever surface, does the job very well, will pull what u want it to, and give u many years of trouble free service. If people feel that it's a dog... Well TQ management does hold it back some and is makes the engine fell that way. Otherwise it will serve u well, enjoy picking one out with what u want.