Not sure what you mean by the rpm comment. I have a 2012 supercab 4x4 with 3:73 gears and tow a fifth wheel camper weighing around 10,000# loaded. The truck is rated to tow 11,300#. Towing at 60 mph in the Cascade mountain range the highest rpm I've seen is around 3000 on the steepest grades (like the Santiam Pass when the truck shifted down into third) and I could have easily pick up speed. Torque curve charts show 90% of peak torque at 1,700 rpm.
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