I'd heard about it, but never experienced it until now and don't want to again.

On my way home from the Mudgee Field Days on Saturday I came across a friend of mine broken down and parked in a bad location, so I dragged him off the road, he'd done UNI on the tail shaft and had another one on the way to change out(he's got an old rodeo)
I left him as he had someone coming to assist and headed home, got up to about 80kph and next thing the whole front of the JK was shaking and wobbling all over the place, a very scary experience, I pulled over and checked under the thing, but nothing stood out, so started driving again, same thing happened again shaking and wobbling, stopped and got under again and still couldn't see anything??

Started driving again and nothing, no shaking or wobbling and hasn't done it since??
once I got home I jacked it up, checked wheel bearings, play in bushes etc, still nothing??
There must be a bit of paly in something but I can't find it.
I don't want to go and replacing everything(bushes/ball joints/tie rods) because you won't know what actually fixed it.
Is there any tricks that could determine the issue

Any idea's

Andrew