Do not consider renting out your coach UNTIL you talk to YOUR insurance company AND BofA. Check your LOAN DOCS. I believe you'll find verbiage that prohibits the use of the coach for anything other than personal use. In every contract I've done with BofA that's in there, and I've been dealing with them since 1962! BofA is no longer doing RV loans and they will no longer refi them.
That said, your best advice so far has been to contact your local branch MANAGER and explain the situation and ask for assistance for relief. Assuming your credit is still viable, you might be able to get a loan for the difference between what you owe and what you get. You will increase your probability of success if you have a plan of action that you take with you when you talk to them. Contact someplace like PPL in Houston and get, in writing, what they feel your coach is worth on the open market. Find out what you MIGHT reasonably expect to receive if it sells AND how long it might take to sell it. With this information in hand, when it's passed upstairs, your success rate increases.
Good luck to you, my friend....sorry for your troubles...Dennis