A motor home on which the interest portion of indebtedness is deductible pursuant to the Internal Revenue Code as an interest expense on a qualified primary or second residence is also a primary or second residence for purposes of ad valorem property taxation in this State and is considered real property rather than personal property for property tax purposes. By ordinance, the governing body of a county may extend the provisions of this section to a boat that meets the same qualifications required for motor homes pursuant to this section.