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They can try to come after her but she has some good defenses.
She could also open an estate for him, especially if she has to clear title to land, etc., and then see if they file a claim as a creditor. If they don't then they can be barred from trying to collect it from her.
She may also want to check and see if he purchased "credit life" insurance when he bought the vehicle.
One thing she can have her lawyer try, assuming that she opens a probate, is to make the claim that he was "incompetent" to sign a contract and therefore the contract is void.
That will often scare them into dropping any claim they might have against her.
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Why does she have any liability at all?
OK is a marital property state as opposed to a community property one but any debt incurred during the marriage for property used by the marital estate can be attributed to the other spouse. In this case I don't think they would be successful, as I said she has a good defense, but that doesn't mean they won't try. If payments were made from the marital bank account and the RV was used by them both (which a court is going to presume) then the credit union can argue that it was a debt of the marriage.