Where would these be shipped to?
It's no longer reasonable to ship from Japan to US after the Yen/Dollar exchange rate became unfavorable.
Also I see this is in the Kubota forum. Used Kubotas cannot be imported here. Kubota-USA got an order for Customs to refuse entry, forcing re-ship at the customer's expense to some other country.
In the past, importers went to Japan and picked out specific tractors to bring over. Even then, quality was unpredictable. Buying from a broker without inspecting the unit yourself would be a huge gamble.
Summary - US importers tried this several years ago. Today I don't think anyone is buying from the salvage yards in Japan to import to the US, it isn't profitable.
If you are in Vladivostok or some place close to Japan it might be reasonable.