Class-B Motorhome RV, typically referred to as a van conversion or van camper. The size of the Class B Motorhome generally varies from sixteen feet to twenty-one feet. The Type B-Vans represents a street van, or panel motortruck, that's been custom-built for Motor home accommodations. The upraised roof of Type-B Motorhome permits ample headroom. The Class B-Motor home it is easy to drive, and fuel efficient - Local Cadillac used Class-B RV motor home vans on sale are normally very sought after.