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I have the same unit. I pull it with a 2004 diesel duramax 3500, 4 door,double wheels. So far ( after 30000 MILES-2 trip from Mtl to the Keys) my personal rating is the best truck on the market. On highway ( without the 5 wheel ) I AVE 20 MILES PER GALLON ( ON CRUISE CONTROL AT 60 MPH). God knows all the hills on highway 81 from the border to highway 77. No problems at all with this truck.
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