High profile tyres for Allroad?

I'm considering buying an Allroad, which I'd like to at some point take
through remote outback Australia across some long rough unsealed roads.

My question is: should I be concerned about the durability of the
low-profile tyres, and if so, is it possible to fit it with more practical
alternatives?

And also, has anyone had any experience in replacing the space-saver with
something more appropriate in a 4WD?

Thanks,

Gordon