can i file bankruptcy against our mobile home we want to get out of our mobile home

You do not file "against" anything.  You file for bankruptcy, disclosing all of your assets and liabilities.  You are then discharged from having to pay most of your liabilities.  If someone else is on the debt or if there is collateral, the creditor can not go after you, but can go after the other person who did not file for bankruptcy or sell the collateral.  You can get out from the amount you owe on the trailer if you plan on leaving it behind.