With excellent credit I was at 4.8% for a 28 hour used BX2380 in June 2020 with KCC. Not sure if that was because it was considered "used" or if the zero percent just wasn't being offered at the time. I paid up front to have a loader installed instead of financing it with the tractor. Those 28 hours saved me a few thousand over buying new, even with a $600 delivery fee because the dealer was a few states away.
But yesterday I paid it off 3 years early so the rate has become null & void. I have no proof that the 2 posts previous to this one are true about the zero percent just being factored into a higher purchase price. But I can't say that I'd be shocked by that.