Has anyone had this happen. Slow around town driving, nothing but at load and freeway speeds if there's a small undulation in the road (not visible), and a wheel hits it just right. The whole car jerks once to one side and you have to grab hard at the steering wheel to correct it. I have two guesses. But wondering what others think. At first I thought it was a jerk. But then I wonder if it's not a steering thing but more a load shift thing.. One jerk and then normal. Intermittent. Maybe more or less every ten minutes at freeway speeds. And it's really scary so I haven't been able to catch if it shifts just to just one side or either and both sides.