If you invest in America, there are 2 structures available: LLC (limited liability company) or C-Corp, the shares of the company is owned by the trust in Australia.
Because US is a broad tax country, you can quarantine the income in US. If it's not a broad tax country, you have to pay tax there as well as in Australia, no credit for the tax you paid over there.
How to bring back money:
1. money initially sent over for investment can be brought back tax free
2. I can charge a consultancy fee to the LLC there, so the LLC get a tax deduction there but I'll have consultancy income in Australia
3. Different to Australia, the cost to go over there for inspecting future purchase is deductible under US tax law.
4. LLC lend money back to Australia
The US insurance companies don't normally have landlord insurace equivalent. Only normal building and content insurance is available.
To get a credit rating with the banks in US, apply for a credit card and start using it. Generally >4 units are regarded as commercial over there.
Same as any investing, sensibility analysis and opputunity cost analysis should be performed. For the additional risk investing overseas, you need higher return (for yield or growth) to compensate it.