Camper
The Camper is a a small bus in Grand Theft Auto: San Andreas. It is rarely encountered on streets, however has some spawning points across the State of San Andreas, such as the summit of Mount Chiliad. It cannot be modified at any car shop.
The Mothership
The Mothership is a variant of the Camper vehicle, which is owned by the marijuana using hippie The Truth. The differences between the Mothership and the other Camper vans are the psychedelic hippie paintjob and, as you learn when you're introduced to it in Are You Going To San Fierro?, the fact that it runs on 15-year-old cooking oil.