What happens when you default on an installment loan?

We have an RV that we can no longer make the payments on. Can we just let the bank repossess it? Can they put a lien on our house or garnish wages? Our credit is already wrecked so we really don't care about that aspect of this problem. We are trying to sell it but we owe alot and don't have the money to make up the difference if we sell for less. Help!?!