Many loan companies will not loan the money because of the age of the rv - not because the people have bad credit. Some here obviously don't know the obstacles that you run into - some won't loan less then 50,000.00, so if you want to buy one of lower value, they won't loan to you.
I wouldn't hold the loan for anyone, but can suggest that if they are serious, have them try credit unions. We purchased our 10 yr old unit, financed with a credit union. They just wanted to make sure the value of the coach was as much or more than we were financing. They were willing to finance what you needed, not place some minimum or age in the rules.