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When you filed (I'm assuming a Ch 7) did you sign a re-affirmation agreement with the people where you bought the truck? Or, did you just keep making the payments on your own?
Of course, I don't have all the paperwork to review, but if you did not sign a new contract (reaffirmation) then you probably had the truck debt discharged and you are just paying and they are accepting. Which is fine, except you cannot do it any longer. Naturally, they will want the vehicle back, but if it had been discharged, there will be no deficiency judgment.