Towed 17,000 lbs. in Nevada 130 degree desert no problem. AC still ice cold. Engine temp remained normal even during steep hills. All dealership maintenace so no problems. 10 year powertrain warranty ...

Most guys are fiercely loyal to their chosen brand and favored engine, whether it be Cummins, Duramax, or International. Those same guys can't always tell you where their loyalty comes from though.