6.0/3.73/6speed in mountains pulling 8000 lbs
I have 2013 suburban 2500 pulling my new Creekside 27 bh which is 8,000 loaded. First trip with this combo over Stevens pass hwy 2 in Washington state. Once the serious climbing started I was 2nd gea...
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I think the steepest I have been on was 7% and it was in/near Chattanooga, TN IIRC. It was the only time my 00 Excursion downshift 2 gears and I still had to floor it to maintain 55 mph with trailer in tow.
