 This is the second Ford Super Duty we have owned.Our first was a 2006 F-250 Diesel and the vehicle smoked like crazy.The dealer could never fix it, we got rid of it with 19,000 miles on it and bought a 2009 F-350 FX4 Diesel.What a mistake that was.We have a fifth wheel trailer which is why we need a Super Duty diesel.The truck bucks and chugs when the trailer is on, Ford doesn't know what to do to fix it.The truck has also gone into limp mode 3 times while going up hill on the highway with the trailer on the back.We go from 65 mph to 50 instantly and then have to limp it off the road.Ford cannot find the problem.We are going to buy a Dodge now, I will not buy another Ford.