Subject to s. 409.311(4) , the method provided in this chapter of perfecting and giving notice of security interests subject to this chapter is exclusive. Security interests subject to this chapter are hereby exempted from the provisions of law which otherwise require or relate to the filing of instruments creating or evidencing security interests.
Wis. Stat. § 342.24
Motor vehicle law provisions relating to security do not apply to a mobile home that has become a fixture. George v. Commercial Credit Corp. 440 F.2d 551 (1971).