I'm guessing that he bought the truck for $X new. Sold at auction it was only $Y which could be, maybe half the value. Add in repossession fees and you're left with a balance of $X - $Y = (amount left on load) + $Z (repo costs) = $9,000. I'm not sure what there is to do. It's the amount you borrowed and that is what you owe. Simply saying "I don't have it" doesn't just make it go away. Someone is out the money and they want it back. Typically the answer is that if you don't have the money and it's a big stretch to buy something new, don't buy it. I'm sympathetic to your situation but I'm not sure why there should be another conclusion short of a bankruptcy proceeding, which should rarely if ever be done.