vanip, just for shizz and giggles, have you tried going back to OE wheels and seeing if the wobble goes away? I remembered a 4x4 SUV that I went aftermarket wheels on and I got the death wobble at highway speeds like you indicated. Had alignment and tires done but wobble was still present. Come to find out, after trying the OE wheels, it was the aftermarket wheels being out of round that caused high speed wobble. No wobble when original equipped wheels installed.