There are class C's built on van chassis. The definition is that class C is constructed on a cutaway chassis, constructing new "RV walls" at the RV factory, an

There are class C's built on van chassis. The definition is that class C is constructed on a cutaway chassis, constructing new "RV walls" at the RV factory, and class B uses the original "vehicle walls". A class B will get generally better fuel economy than a class C, because it's more aerodynamic, narrower and not as tall. Of course, a class B will have less interior room. https://rv.org/pages/class-c https://rv.org/pages/class-c https://rv.org/pages/class-b https://rv.org/pages/class-b