I had my tyres balanced when I had my last service. Immediately the Patrol had the 80 kmh wobble. I then took it to the guy I have bought my tyres from for years (and never had a balance problem). He says that most tyre balancing machines are designed for use on passenger cars. His machine costs many thousands of dollars and has the proper attachments to suit the wider, heavier 4WD tyre. He removed the large amount of weights the mechanic stuck on the rim, re ballanced the tyres, and the problem went away.