There is no 14-day stay requirement in order to deduct second home (including RV) interest on your tax return. You may be confusing this with another tax issue associated with second homes. You can rent it out for up to 14 days and still consider it a personal vacation home and not pay taxes on the rental income. Totally different issue.
To get a personal tax deduction for an RV, according to the IRS, all “second homes” must be used as security of the loan that you are deducting interest and must have basic sleeping, cooking and toilet accommodations.
Also, if you are hit with the alternative minimum tax, generally you lose your RV deduction at that point.
Thomas/NH wrote:
How about buying a new one, finance it, declare it a second home and deduct the interest. Just have to spend more than 14 nights to qualify.