Changes the federal definition of "manufactured home" to explicitly include homes built "with or without a permanent chassis" and requires States to certify to HUD within a set timeframe that their laws treat chassis-less manufactured homes the same as chassis-equipped homes for financing, titling, insurance, taxation, manufacture, sale, transportation, installation, and other HUD-determined areas. If a State fails to timely certify, HUD must publish noncompliant States and newly manufactured covered manufactured homes cannot be manufactured, installed, or sold in that State until certification is provided and accepted; HUD must also provide model guidance and coordinate with other federal agencies.