On monday I was hauling heavy about 18,000lbs of sod on my goose. was going aroud a slight curve and the truck shifted. it felt as if the axel shifted in the u bolts. luckily I was less than a 1/4 mile from were i was unloading. Makeing a slow turn felt a large shift and a loud clunk. felt like my flatbed was going to come off. now unloaded the truck will do the same one way and then back the other. I have inspected every possible thing I can think it might be. pulled both axels no wear on ether and the bearins are perfict. pulled the pumpkin cover checked all the bearing and gears with no sign of wear. under the truck there is no sign of shifting in the u bolts the springs have not moved and the bed is welded so good it will never move. Any ideas would be helpfull . losing buisness in kentucky.