How an Aussie can buy and insure Van in US for world trip?

[22cash]

Hi all, anyone know what's required for me to purchase a campervan in the states that I can travel to Argentina and beyond with? Is it true a carnet is not needed in Nth or Sth America?

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[BajaSportsmobile]

https://en.wikipedia.org/wiki/Carnet_de_Passages

Just buy one. I would register in South Dakota for ease and cost reasons.