My SIL, her husband, and whole family had a similar deal. Were just passing a big rig and he changed lanes. Caught the rear end of their mini van and they got the ride of their lives. Several miles pushed by the truck. He finally stopped, thinking he 'might have a flat'. Miracle they weren't all killed.
I hate passing trucks. Try to do it as quick as possible. Aside from minimizing the time in the 'kill zone', it probably doesn't matter...if the lane change happens you're certainly going to obtain some level of FUBAR.
