In 2015 we decided to ship our secondhand Burstner Motorhome to Australia when we returned after spending 4 years touring in Europe. The conditions that were applied to us by the Australian Govt were for a returning Australian citizen who had owned and used the vehicle for more than a year. The landing steps were the ones that we had in New South Wales and the regulations for road approval were those for South Australia.
This is not applicable for shipping a motorhome for touring and then returning. It would be a lot simpler if that is the case. If someone is planning to import into a different state then check their rules before commencing the process.
I have included shipping and compliance costs.