To do it properly....( Beware, I hate Queensland Transport with a passion)

You need to fill out a transfer of registration form from queensland transport. It needs to be signed and filled out by the owner and the new owner almost while in the same room. I'd ask for it filled out as much as possible by the owner when taking possession of the car.

QLD Transport sent my transfer of registration back to me twice in the mail, telling me I needed to have all sorts of docs that were impossible for me to obtain without flying up to Brisbane. They also wanted to charge me for transfer of rego, which is what NSW rego people would have double charged me for also. I ended up telling them to get stuffed, and returned the plates to the NSW registry. And re-registered in NSW.

So it's not super easy. May be more difficult as the car is modified. Call QLD Transport and ask them what you need to do. Get a Name and number of the QLD transport representative before hanging up. You'll need someone to quote, because they'll change their story if you ring them twice.

BTW, I'm very sad that such a Datto sellout needs to happen. I reckon your ute is a bargain at the asking price. You couldn't build one the same at twice the price.

Cheers,
Chris