After studding this you are both wrong.
Since an RV is a “dwelling unit” and considered a residence, it falls under a peculiar part of the tax code (§280A ) that places specific restrictions on deductible expenses for dwelling units. Whenever one uses a dwelling more than 14 days for personal lodging or >10% of days in which the dwelling unit is rented to other parties, deductions for the dwelling are limited to income derived from the RV or within the RV (like an office in the home) or not allowed at all. Once you watch TV in the RV or do any personal act, you are using the RV for personal purposes as a dwelling and cannot deduct any further expenses. This is true even though you are using the RV as a second residence to deduct rent for an apartment at the assignment location normally. The ownership changes the deal. You cannot deduct the costs of the RV nor depreciate the RV since it is used as a residence > 14 days.
