The construction company I work for has nothing but chevy's. We have a fleet of approx 50 trucks, they are all 2500hd, ext cab, 2wd, 6.0. Of course we dont have any diesels, nor 4wd, but we buy the chevy's because they last a long time, are easy to work on, and company tradition. We do have 1 04 f250 that we got when we bought out another company. It just sits there most of the time because no one wants to drive it. Since we've owned it (a yr and a half) its had a new motor, and 2 new transmissions, and we have put MAYBE 25,000miles on it. The truck I am driving is a 2006 2500HD with 137,xxx miles on it, and it aint had any problems. We drive the piss out of the things and that ford doesnt even have 100,000 yet.
And in this area, the construction companys are about 50/50 split. The power company has chevys for their around town vehicles, but the line trucks that are 4wd, diesel, etc, they are all fords, one reason is because they also order manual transmissions (I guess to save $$) and you cant get anything but the allison behind the dmax.