Welcome! Thank you for your question.
So they can prepare a contract for an installment sale that will work to transfer title or assure that the title transfers upon payment in full of your obligation under the purchase agreement. All that is required under this installment sale contract is to have both you and the sellers sign (it does not have to be notarized).
Once the installment sale contract is signed it is an obligation that the friends estates
would have to follow through with upon their death. The loan would still be an obligation of the estate. If the friends or the heirs
of your friends fail to pay the loan then the financing company can repossess the camper. However, you would still have the right to sue your friends or the heirs for breach of the contract that you signed above. Without the written contract you have nothing that protects your right and all the prior payments you have made.
Is is a form installment sales contract that you can use to meet you needs: http://www.free-legal-document.com/installment-sale.html
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