Rear Suspension problems of the 2006 Ford F-250

I have a 2006 Ford f250 4x4 crewcab with a shortbed that had problems with violent front end oscillation. See odi resume investigation ea 08-007. After the last incident on 8/2/2006, I had the vehicle towed to my local Ford dealer on 8/5/2006. This was now the second time vehicle was brought into a Ford dealership for this problem. The first dealership required that I reproduce this problem for the tech working on the vehicle. I was told everything was fine with the vehicle. This second dealership had my truck until 8/11/2006 and said the problem had been corrected. I was told some metal bushings were replaced in the front end and that chamber or caster was way off. I was also told to make sure and rotate tires at suggested intervals and to keep tires properly inflated. I noticed when I left that the truck had a choppy bounce to the ride and was told that it was from the tire wear. The odometer reading at that time was 22065. After driving the truck for about 3000 miles, I took the truck back to the dealership where I purchased the truck. They road tested the truck, then rebalanced all 4 tires and reindexed the rear tires. These are the tires that were originally on the front and rotated at the second dealership. The vehicle continues to have a choppy bounce ii the ride, which now I was told was normal or acceptable. If the truck would have rode that way when I purchased it, I would have never purchased it. I went from having a smooth riding truck that on occasion had a severe oscillation in the front end at highway speeds 65 and higher, to one that bounces all the time. The bounce in the ride was noticeable to a friend who owns a 2005 f250, that has had none of these problems, although others have with that year also. Turning to Ford in this matter has proved pointless in their willingness to admit a problem with this vehicle or their own engineering flaws. I am currently trying to have an engineer from Ford look at this vehicle.