the mailbox comprises a box portion with wheel - like formations extended thereon , and a separate car body portion in the shape of a car body , but without wheels , wherein the car body portion is adapted to be mounted onto the box portion . the wheels can be molded on the box portion , or otherwise secured thereto , either permanently or removably . the car body portion can be a replica of a nascar racing car , with appropriate advertising on it , which can be used to promote the sponsors .