I have a set of 39X18 Mickey thompson baja belted on 16.5X12 wheel. The tires ride smooth as can be at speed. The problem that I have is around 35-40 if I hit some small bumps it upsets the suspension and the front end shakes violently. I have to jump on the brakes hard to get it to stop shaking and start again. The alignment shop says that it may be the idler arm needs to be replaced. They said if it has any play in it that the big tires amplify it. I called whiplash to see if anyone else had this problem and right off the bad they asked if I had Mickey Thompson's. They say Mickey Thompson's are bad about this. I ordered a dual steering stabilizer and a new pitman arm and idler arm to see if this solves the problem or if it's just the tires. Has anyone else had this kind of problem.