Wis. Stat. § 348.03: Self-certification for agricultural commercial motor vehicles.

(1) The department shall prescribe a form for the owner or operator of an agricultural commercial motor vehicle to certify that the vehicle and its operation satisfy all requirements specified in the definition under s. 340.01 (1o).

(2) The certification on the form under sub. (1) of an owner or operator of an agricultural commercial motor vehicle may be offered to the department or any traffic officer as evidence of the truth of the matters asserted in the certification, but the certification is not conclusive of such matters.