I recently went to my Credit Union and said "I need $9000 to buy a 1999 Dodge Cummins 3/4 ton truck." Their only question was "how much do you want the payment to be?" We negotiated a payment amount, she filled out the paperwork, and handed me a check to pay for the truck.
The motorhome? Same scenario. No problem with the age of the vehicle.
Of course, we have been members of that CU for almost twenty years, and have financed several vehicles with them. That might make a difference!