My 2012 Class A with the V-10 and 5 speed performs well
For as heavy as it is. Loaded for a trip towing our 13 Explorer I’m at 24,500 approx GCW. My only complaint was the lack of power, And mileage. I fixed those 2 with a tune from 5star. This got rid of the too intrusive bribe by wire which would pull throttle back when you needed it the most. And also changed the shift strategy. It now performs remarkably well for its weight, and I went from a stock average last year of 5.2 to a tuned average of 5.7 mpg.
If your truck has the 6 speed auto it will perform even better.