I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
While the court may have directed you to turn the trailer back to the finance company, it is not up to you to force the finance company to take it back and your ex is just out of luck. If he wants his credit repaired he can help you in making it right on the debt----but you will not be in trouble with the court if they don't take it back or if you can't afford to do the porch demolition.
Your options with the finance company are to either pay them or don't pay them. They may or may not sue you and your ex---but the reality is that if you can/t afford to pay them then there is little you can do about it. If you are sued in the future, all you would have to do is file for chapter 13 bankruptcy protection and the debt would go away.
For now, just consider that you have done all you can do---both financially and with regard to asking the lender to take the trailer back. You can stop worrying about it because there really is nothing more for you to do at this point. The ball in in the finance company's court.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
Kindly, remember to rate my service to you. That is how I am credited for assisting you.
I wish you and yours the best this holiday season,