Australia is going to be switching over to a new online Import Application process starting 1 May 2013. The transition to the new form should be completed by 30 June 2013. After then any applications via the old form will be returned.
http://www.infrastructure.gov.au/vehicles/imports/application_forms.aspx
Direct link to the Online Application Form.
If you are unable to use the online form, you can download the application form and applicable addendums for lodgement.
Aussie Spec US Caravans - Australian Compliancing
158 Granite Ave
Ontario CA 91762
909 391 4800
FAX 909 391 4880
1 300 745 961
aussiespecuscaravans@gmail.com
We can convert your US specification caravan, motorhome, or 5th wheel to meet Australian compliancing standards.