When I drive over a bad patch job, shallow pothole, or a bad seam the front end wants to veer to the left the corrects itself. the faster the truck is traveling the worse it handles. I've had the front end aligned,but it still does it. My durango did the same thing, but nowhere is bad.
I hope this is a better explanation.
btw I did have the front end inspected, and the shop did not find any wear on the front end components.