My diesel in my dump truck hits it's 3000 rpm redline holding it down some of our local 15-20% grades at 26,000 gvw. I've never had it scream holding going down a typical 3-4% freeway grade. None of my trucks scream at redline on the steepest 6% freeway grades unless I'm trying to hold less than 35-40 mph due to switchbacks etc.
I've gone 15mph up the 15%grades in yellowstone pulling my Tt with a BB 454 at its 15000 gcw. Same trailer 10 yrs later with a 6.5td at 16000 lbs, 4000 OVER its gcwr, doing 35-50 up those grades, because of the turbo not losing HP at 9-10k ft elevation. If I would have had an auto, same rig was rated to 14500. The auto was lower in performance all around vs the NV 4500 trans set ups.
Current Rangers a bigger than previous models. Way more HP and heard to work with.
Besides, if murderstor Barney can tow a big gooseneck trailer with his Harley, I'm sure OPs truck will tow a 4500-6000 lb rv trailer just fine. Some think you need a tandem axle Kenworth or equal to tote 5000 lbs of trailer. Yeah right!
Marty
