Just had a thought, and this happened to a Canadian couple some years ago, they were unable to drive a motorhome they were thinking of buying as it was classed as Light Rigid.
In Australia a normal car licence allows you to drive anything up to 4500kG in total weight, referred to as GVM (Gross Vehicle Mass).
From there on there are different classes of licence endorsements, the one pertinent for you is Light Rigid. Which is any two axle automobile with a GVM greater than 4500kg but no greater than 8000kg.
The vehicles you are looking at, if they are registered for Light Rigid will require you to have an equivalent overseas licence. It is possible to legally reduce the weight to 4500kg with almost no issues, some of these Fusos are downgraded to Light Commercial, which is under 4500kg. Great idea and I have seen a 4x4 Fuso motorhome outside my own house that had been downgraded to under 4500kg, but they couldn't carry much apart from clothing and food.
The vehicle I gave a link for above, is registered as a Light Rigid. Interestingly the blue coloured plates on the passenger door and near the passenger seat, are there for the various changes from the original manufacturer. Think Super Singles, an additional fuel tank, those kind of changes.
Mick.