Thank you very much! That was very helpful.

I had found through the Queensland Government website regarding overseas vehicles being used temporarily in Queensland a link to a list of insurers to contact regarding CPD. Suncorp was at the top of that list
From the Suncorp link, it appears they have a specific option for CTP for unregistered vehicles. I have yet to contact them since it is now Saturday there but will be calling them first thing Monday to learn more.

I do have a lift on the Jeep and larger tires; however, the lift height and suspension travel increase is in compliance with the allowed modification limit per NSW Light Vehicles Modification standard (VSI.06, Rev. 3). The NSW modification limit is not more than 33% of original travel (was 7.88" is now 8.75" or only 11% increase), and is also only 2" (50mm) higher than stock (but actually not higher than the highest OEM option available).

The tire size is larger than it was stock but not larger than the largest size offered (315/70R17) by the manufacturer. The size over stock is also only 5.6% larger and the NSW Modification limit is 7% (was 285/70R17).

Wheel size is right at the limit (25mm over largest size offered by the manf.). Original was 7.5" wide. Largest size offered by the manf is 8" and it is currently fitted with 9".

For my trailer, I actually got it approved and added to the Register of Approved Vehicles (RAV) in Australia. I happens that there is a fairly broad exemption for home made trailers (which mine is) but the trailer was in substantial compliance with the nearly all of the requirements regardless.