Shermatt, Have purchased cars in many states including Michigan, Kansas, Oklahoma, Tennessee, Colorado, washington, Nevada, New Mexico and after a quick call to my Insurance Broker in San Diego for No Fault Insurance cover, for this I did need a U.S. address, have then gone along with the seller to thier local DMV, transfered the Title and in some cases registered the car and then Driven to LA, all on a Queensland Drivers licence.
Have been pulled over on many occasions, , booked twice and the Queensland licence has not been an issue.
Attached is a pic of the two cars I purchased early last year for four of us to participate in the Mustangs Across America Run to Birmingham Alabama for the 45th Mustang Anniversary celebration.
Both cars were titled and registered in my name with a Qld licence. We crossed fifteen states and did 6500 miles.
On the way back to LA we were pulled up by the Highway Patrol near Lake Charles in Louisana, and after showing the officer the Titles, Insurance and QLD licences and explained what we doing, I thought he was going to take us to the nearest bar and buy us a beer.
I have even had my F150 drive truck registered in California to my Queensland address and then had it renewed for three years running, with only a QLD licence.
Going back a bit, I bought a new Yamaha DT250 Trail bike in San Diego in 1979 and registered it along with my $600 1965 6 cylinder Mustang Coupe, ( my first Mustang) and used them for a year on a Qld Licence.
Last time I had an International licence was 1974.
If you are not a Permanent Resident an Australian licence is acceptable.