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If you both signed the loan, then you are both responsible. You cannot force the creditor to go after him and not you. Your divorce paperwork should have spelled out who would be responsible for which debts. If the divorce decree said that he would be responsible, then your remedy is hold in contempt for not following the court's order to pay... but it iwll not change anything with the creditor.
As for your home, they may not attach it. You can work out a payment arrangement and they probably wont attach your home. Or you could file bankruptcy (which might be a good idea, given all you have told me). A bankruptcy could discharge the unsecured debt (the repo) and allow you to keep you home.