I'm hoping one or more of you can help with this problem.
My 2001 Highlander (50,000 miles, 6cyl AWD) started to raod-slap and felt as if I'd just blown a tire. I was doing 60 +/- 2 on a smooth highway and was about 65 miles into a an 80 mile road trip that for the first 60 miles was dry pavement. The last 5 were wet from a passing rainstorm. The steering response and the noise/vibration was very like a suddenly very out of balance tire, severe shimmy, a pounding up through the frame and steering wheel. I slowly drove (~ 40 MPH or so) 3 miles to the next little town and as I slowed to