I have 4:11 axle ratios with standard ratios being 3.73 if I recall correctly hence the choice for 37" tires. I pull this 22' trailer up every mountain pass and don't even know it's behind me usually just under 2000 RPM
The Cummins diesel works great at pulling trailers!
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When you hit the pearly gates I want to be there just to see the massive pile of dead 5hit at your feet. ( John Peyton)