The answer to your question depends on the language of the agreement for the third party to take over the payments. Unfortunately, if the finance company did not expressly release you from the loan, you are probably on the hook now that the "new owner" has defaulted.
Depending on the circumstances, you may need to consider personal bankruptcy to avoid the debt.
You'll need to hire an attorney to review all the relevant agreements and tell you your rights and responsibilities. It does appear you may have some options available to you. If possible, you may want to reattain possession of the RV and contact the broker and see what he can do for you. This should probably be done in conjunction with an attorney.
The above statements are provided as general information and not intended as legal advice. Each matter has its own set of unique circumstances that cannot be adequately addressed without consultation. You are strongly advised to hire an attorney licensed to practice law in your state to represent you.
In theory, you could have bought out your liability to the seller when you returned the RV. Read your paperwork to see what the agreement was at that time.
I assume that the person chasing you for money is the broker from whom you bought the RV. If so, the broker has to mitigate the broker's damages. That means that the broker has to take reasonable steps to retrieve the RV, and re-sell the RV. If the RV sells for at least the balance due on your note, then the broker has no damages. You should receive a credit for any money that the "new buyer" paid.
Ask the broker in writing for an accounting of all revenue from payments for the RV. With your two years of payments, and the "new buyer's" payment, and with whatever the broker receives from a re-sale of the RV, the broker may not have any damages. Also, ask to inspect the RV to see its condition, and to determine why it broke down. Perhaps, the broker failed to disclose defects to the "new buyer." Also, ask the broker for identification of the "new buyer" as the "new buyer" would be responsible for payments on his or her note to the broker, unless the "new buyer" had a good defense of some sort. Theoretically, you could implead the "new buyer" in any suit that the broker files against you, and seek to have the "new buyer" held liable for the broker's damages.
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