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Welllll ............... reading through all this, I had the same problem with mine some time ago. I always buy my tyres from the same tyre outlet and then have them rotated by my usual mechanic when I get a service. One time when he rotated them he also balanced them and after that I got the dreaded wobbles. I took the car back to the mechanic and he said the balance must be out and I stood there watching him for over an hour as he tried to balance the front wheels. His machine came up with all sorts of odd readings. He finally finished but when I took the car out on the highway the wobbles were back. I took the Patrol to my tyre place and they balanced the tyres in no time and the wobbles went away. I asked the tyre guy (a long time friend of mine) why this happened. He said a lot of mechanics and even some tyre places have balance machines that are fine for normal passenger tyres but are useless on wider and heavier 4WD and truck tyres. He told me his machine cost him many thousands of dollars and it is suitable for the larger 4WD and truck tyres.
Not saying your problem is the same - but I have mentioned this to other Patrol owners that I know and they have gone to a tyre dealer that specialises in truck and 4WD tyres and their problem has gone away as well. It's a cheap thing to try before you spend lots more money.
Yep that's why some go for the beads due to the fact local balancing machine cant do the job properly in the first place.