I tow with a 32 foot class a motorhome powered by a Ford 460. Dry weight is 14,400 and GCWR is 25,000. I have towed a 4500 pound jeep on a 2200 pound trailer with it. Best gas mileage was 6mpg and worst was 3mpg in a windy storm. I loose anywhere from 10 to 20 mph going up hills depending on the grade. It has a Dana 80 rear with 5.13 gears in it.
