Why do you feel the need to mention that they're American? This isn't the first time you've done it. An Aussie guy posts a truck and you have to mention that it's an American truck. Everyone knows you fucking wanker. Everyone knows.
Aussie built Kenworth, made right here in Bayswater Victoria, I have been through their plant. Some bits re imported, like the driveline, but most everything else is made here - https://www.kenworth.com.au/
A few years ago the Australian Government forced the American truck manufacturers who sold trucks here to have frontal, roll over and side crash testing done before they could be sold here. Euro trucks were already doing it