2001 Ford Taurus Braking AND Driving Vibrations

My brakes periodically cause vibrations when braking at all speeds and all applied pressures, usually resolved with a rotation of warped rotors. However, even with new rotors, the vibrations are starting earlier and earlier after rotations. Since 99% of my driving is high-speed, rural, open interstate driving at 60 mph or higher, I find this to be troublesome. It took only 5000 miles between replacement of rotors with original equipment and renewed braking vibrations.

And recently, my car has been vibrating, sometimes severely, sometimes gently, sometimes not at all, when I am driving at all speeds, even slowly, and not applying brakes. I find this to be even more troublesome. When doing very slow driving, say in a parking lot, I can feel the pull of the tires in my steering wheel. My dealer repeatedly says, "Everything is fine." I gotta get this fixed before Xmas driving. Any help? And thanks!