Quite a few states already include motorhomes under their lemon law but exclude the "living facilities" or some similar wording. Others may specify only the motor vehicle part (the chassis) and some exclude all large vehicles (typically those over about 10,000 lbs).
Virginia is one whose lemon law that covers the chassis but not the "house".
Here is a short summary for each state: State Lemon Law Summary
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL