Must have changed as Shannons would not insure my 99 GU for an agreed value only market which is pittence (from memory they said around $10k). I went with DGA who wrote the policy with Allianz, value of $21k plus $6k extras and covered anywhere in Aust. Some of the ones I did look at would only cover you on gazetted roads which in the case of a 4x4 is not really practical.
There was another mob noted on the insurance posts here and they were pretty good as well from memory.
All up I pay $728.00 annual premium