Had a new horse trailer delivered this A. M. from OK. Truck had 559,000 and change on the odometer. Drivers seat bad worn out but rest of truck was in ok shape. Had a front engine oil leak at around 510,000 that required a sleeve to repair. One clutch assembly due to a throwout bearuing failure,one set of u/joints. NO engine or fuel system work,NO transmission or Transfer case work. No front end work. Overhead was showing 18. 8 mpg in my driveway pulling 4600llb gooseneck trailer. Left here for Conyers Ga. to pick up another trailer going to AZ. then dead heading home to OK. He said that 95% of the haulers are using Dodge. Very few Fords and most of them are last of the 7. 3. Only sees a D/Max once in a blue moon. Also said some have fueling boxes,big exhaust,gear splitters on them but all it seems to do is run up operating cost. Says STOCK is the best fuel mileage and least repairs. Also said 70/72 mph was his limint speed wise.