Here's a possibly workable plan B:
OP rents the tractor to a friend, uses the rent to keep Kubota happy, when he gets back on his feet, he gets the tractor back and resumes making the payments himself. (Friend has to give the money to OP, who sends it to Kubota, there's probably a due-on-sale clause in the finance contract. Make sure the money actually GETS to Kubota, OP may be in such difficulties that he diverts the payment stream.)
Friend gets the use of a tractor just for the payments, OP eventually gets to keep the tractor (nobody goes to the slammer) and Kubota stays happy, they're getting paid. Alternately, the friend makes the rest of the payments (through OP) and keeps the tractor if OP can't get going again or just no longer wants it. Same caution as above.
Again, we don't really have enough information to determine what is actually going on here. If everyone is on the up-and-up, plan B might work. If someone is playing games, well, they deserve whatever Kubota and the law does to them.
Best Regards,
Mike/Florida