I have a 2007 Laramie 4x4 quad cab with 132k miles on it. After 2 different sets of tires and 3 front end alignments my truck still shook between 74 and 80mph. I have just put on 4 new tires and rims thinking maybe I had a warped wheel. $1500 later the truck still shakes at above listed speeds. The shop that installed wheels and did a 4 wheel alignment says they checked wheel bearings, ball joints and tie rod ends and everything looked good but it still shakes. Any ideas or cures?