Dean
If this is what I think, you are operating at a resonant frequency of the TM & TV. That means, it is bouncing up & down like a spring. You should be able to change speed to not feed the "system" at the resonant frequency. By slowing or speeding you can move to a higher or lower frequency and the amount of bouncing should decrease.
That's techie talk, I guess. Just remember to change speeds, either up or down next time that happens and see if the ride doesn't smoothen out. I am sure that you don't have this at say 10 to 30 MPH. Maybe it peaks at 50 or 60. The speed will depend on the spacing of the stripes in the concrete, so speed may have to change on another section of highway.
Sorry to hear this. Check back if it doesn't cut down with these tactics.
Another thing is your TV shocks. They dampen this kind of action. If your shocks are bad (OEM 5 or so years old) that could well be the cause.
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