First thing, you do not have to lose a vehicle in bankruptcy, if its chapter 13 then you will continue to pay it to the trustee, but probably at a better interest rate, the unsecured will be canceled. On chapter 7, I'm pretty sure you can reaffirm and keep that payment going for the auto. The credit cards( all of them) will get closed. But if its chapter 7 then you will be able to get another one not long after discharge.
Just not paying will likely result in adverse action by the card you keep open whether they would close it or reduce your limit each month until its nothing and then close it depends on the creditor.
Depending on the amounts and creditor of the other cards, you will likely get sued for the balances plus a bunch of other fees which will make the hole harder to get out of. Not to mention the endless collection calls.
I would suggest you spend some time over in the BK forum and look at options. Talk to a lawyer( talking does not cost) and look at your individual situation before going the not paying route. I was always hesitant to file bankruptcy and held on as long as I could only to still having to file. In hindsight I should have done it a lot sooner. Once you are in the situation of being overextended its hard to dig your way out, but it can be done with discipline and cutting out all extra expenses, even the ones you don't think are extra but really are.
