Who has had the problem and with what resolution to twitchy, wandering steering at 65+MPH? The car doesn't track well and needs constant small corrections to keep it in the lane at higher speeds. It seems to be worse around trucks and large vehicles, hence air turbulence. Alignment? Body roll from wind gusts? Anybody seen an aftermarket sway bar for the '04 Prius yet? Please let me know ASAP as I have an open case with Toyota Corporate Customer Service on this issue and would like to hear from others with this problem.