jumedw,
Congrats on the new van. Personally I am with RACV as we get significant policy discounts and roadside assistance.
Insurance is one of those very tricky questions. The devil is in the fine print and also depends what sate you are in as to who you can get coverage from. Make sure you read the PDS fully. One of the key issues as mentioned above by others is the Expanda's canvas bed ends and pop-top. Some insurance companies will not cover access through canvas, while others will and then there are others that will also cover access through the canvas annex.
There are many great posts and discussions on the forum, just do a search for "insurance".
The power of the forum was demonstrated as you will see when reading of one insurance company (CIL) that is sold by many caravan dealers. They did not cover the canvas entry issue, so many forum members cancelled their policies and went elsewhere. This loss of business and very negative publicity has caused CIL to change their policy for Expanda type vans.
All I can suggest is read the many threads on insurance in this forum to get an idea of the questions you will need ask when getting quotes, then when you are ready, hit the phone for a few quotes.
Remember, you can also get cover over the phone so you can get the van home, then there is a cooling off period or you can always change policy at any time as many have done recently.
Good luck and happy Pandering
Rohan