That depends. If you use the camper for Business purposes, you can claim the loan interest as a Business Expense on Schedule C.
If you use the camper as a second home, you can claim the loan interest as an Itemized Deduction on Schedule A.
If you rent out the camper, you can claim the loan interest as a Rental Expense on Schedule E (you have to report Rental Income also).
Here's more info on Loan Interest for RV or Camper.
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