Just completed first tow....good and bad!,
As a newby, We just finished our first tow with a 2011 GMC hd 2500 6.0 gas from st louis, mo. to harrington beach campground north of Milwaukee, Ws. Trailer is about 8000 pounds. Trip was about 860 mi...
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Constant shifting also creates heat. Heat is the enemy of auto transmissions. I personally would leave it in 4th and use 5th only on long flat stretches. You will probably find that fuel mileage will not change much if any, and your transmission will thank you.
