|
Since you've gone down most of the list already, the only thing I can say is double check the rims - it may be that some are out of round and tires are forming wobbles and shakes to them after a while. Also, as a last resort, the wheel bearings/hubs? Is the problem an engine or trans mount (not likely as it is not just intermittent but gets worse with tire wear). While it is not totally unusual for there to be manufacturing defects in some tires, it just doesn't seem like the frequency with which you have been experiencing the problem matches that chance.
Otherwise, it seems everything I can think of has been covered. Best, L.
|