Vans may either retain their original body and be upfitted inside, or may be based on a chassis without the original body with a modular box body fitted instead.
Similarly, modern ambulances are equipped with or to enable them to contact hospitals, either to notify the appropriate hospital of the ambulance's pending arrival, or, in cases where physicians do not form part of the ambulance's crew, to confer with a physician for medical oversight.
By design, most apparatuses cannot transport patients unless they can sit in the cab.