This sounds like bad camber/caster to me.
We call this "Death Wobble" on lifted jeeps.
It can be caused by all manner of things but an allignment should fix it.
My H3 was finally over 500 miles today so I took her up to 80mph on the freeway.
I hit as many potholes as I could and it ate it up without any problem, so something is up.
Get the dealer to test drive it and sit with them and tell them how to create the problem.
HTH
-C
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