My coach was 10 years old when I bought it. The selling dealer arranged financing through Southside Bank (headquartered in Tyler, with several branches in the Fort Worth/Arlington area). I paid about 40% of the purchase price as down payment, and got a very good interest rate. With the large down payment, and short term of the loan, I don't think it mattered how old the coach was. I'll never be upside down.
You may want to contact Southside. It looks like their closest location to you is in Granbury; they also have an ATM location in Stephenville, but that probably doesn't do any good as a place to actually talk to.
Southside Bank