The answer to your question depends upon what type of bankruptcy the deceased filed and the need for more facts surrounding the circumstance. Generally, upon the death of a debtor, a Chapter 7 bankruptcy case will continue; however, a Chapter 13 case can be dismissed. Since the bankruptcy trustee seems to have placed all of the property in probate it appears as if the bankruptcy is proceeding which may indicate the deceased debtor filed Chapter 7. Also, if the wife is interested in disclaiming her interest in the vehicles and the vehicles are of no value, you might be able to use this disclaimer to persuade not only the probate court but also the bankruptcy trustee to allow you to continue with disposition of the vehicles. Regardless, it is highly recommended you seek legal counsel familiar with Federal Bankruptcy Code and Rules and California Probate Code before you do anything with the vehicles.