I'm ready to give up. I've got a 33 lowboy with a Pete and Jakes straight axle, Unisteer, ET 3 wheels, and radials. I can't get rid of a shimmy that starts around 62 MPH. I've replaced the front shocks, king pins are good, it's been alighned with a 1/8 toe in. I just tried ceramic beads in the tires, and it didn't help. Any ideas?