Only if used in a business. Sorry only mortgage interest and some investment interest is deductible on Schedule A now. Other interest like credit card and loans went out many many years ago. Like in the 80s or 90s? A RV might qualify as mortgage interest.
if the RV isn't used in business for the interest to be deductible as home mortgage interest it must be a first or second home. if must have a functioning kitchen and bathroom and sleeping quarters. the bathroom must have toilet, sink and bathing facilities. the kitchen must have a stove and fridge. the RV must be security for the mortgage.