This poll is too generic and meaningless. Towing includes truck equipment like engine and axle ratio, and experiences according to trailer weight classes. It seems to be a popularity contest for brands of trucks.
Well, here is my tow rig, probably a little older, more miles, and the so called dreaded 6.5 diesel. Its a 2000 k3500 with 242,000 miles. We pick up are new 2014 Jayco Eagle HT 27.5 rlts in a couple weeks.