We tow a 37' 5th wheel with a 2012 Ram dually, with Cummins diesel. While the truck was in the shop, I borrowed a 6.0l Chevy 2500 with 4.10 rear end. I am glad we have a diesel, because the 6.0l had to work hard pulling uphill, and it was almost impossible to hold speed without shifting to a low enough gear to get engine up to about 4,000 rpm. Buy a diesel. The torque they produce makes it much more enjoyable to drive.
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