Welcome Lola, There are several companies that specialise in Automotive insurance - Few on here could advise a premium for your vehicle , you need to apply for a quote from insurers directly - your circumstances such as age , address, driving record, type of use, etc are factors that will effect your premiums.
The specialist insurers for RV vehicles are CIL, Ken Tame, 4X4 .com,
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Possum; AKA:- Ali El-Aziz Mohamed Gundawiathan
Sent from my imperial66 typewriter using carrier pigeon, message sticks and smoke signals.
I agree with Possum3, that CIL, and Ken Tame are reputable insurers, for travellers
Also, RAC in each State, if your vehicle fits within their height/weight/length restrictions, is also another reputable insurer
I can only repeat what Possum3 has already said, to contact every insurer for their price/PDS (Product Disclosure Statement)
Then pick the one, which best suits your situation
If you are over 55 years old, you could try APIA. We have found them very good and particularly so we we needed to claim on our policy.
Read the policy inclusions etc as we found that these varied widely and cheap is not always the best.