First Drive after building, Major shake

The shopping cart reference was a real good one......we call um buggies down here, but anybody would understand what you mean. The only thing I see that would really negate any of that to me......and I could be way wrong.......would be the steering linkage. As long as everything is in good shape with no extra slop, I think that would keep and buggy wobble, lol, at bay

I could be wrong, it's happened a time of million before. lol

I agree with questionable linkage and wheel tramp.

My son's lifted Jeep gets the " Death Wobble" at certain speeds (even with dampers).
It just takes something to upset the harmonics(?). He slows or stops, then resumes with no wobble.