(1) Each recreational vehicle-type unit, as defined in s. 320.01(1)(b), manufactured in this state or manufactured outside this state but sold or offered for sale in this state shall meet the Uniform Standards Code ANSI book A-119.2 or A-119.5, as applicable, approved by the American National Standards Institute. Such standards shall include, but are not limited to, standards for the installation of plumbing, heating, and electrical systems and fire and life safety in recreational vehicle-type units and park trailers. However, those park trailers exceeding 400 square feet shall meet the Federal Manufactured Home Construction and Safety Standards and shall have a United States Department of Housing and Urban Development label. (2) Trailer hitches or other trailer connecting devices manufactured, sold, or offered for sale in this state for use with any trailer governed by this section or for use in towing boats must conform to the certification standards in Vehicle Equipment Safety Commission Regulation V-5.