The van is a large, full sized passenger van with very light blue paint (mostly covered by dirt and rust). The interior includes a significant amount of homey comforts, such as chairs, plaques on the walls, an amplifier and other musical accompaniments (keyboards, microphones), and marijuana smoking paraphernalia. The van itself serves as a makeshift recording studio for his concept album, We're Banging Aliens.
When pressured by Anders about the condition of the van, as well as the markings (shown above), Karl simply replies, "I wrote that. The van doesn't have any locks, and the word RAPE keeps all the weirdos away, bro".
The van doubles as HQ for a breaking & entering mission in the Season 1 episode, Checkpoint Gnarly.
RAP MUSIC VAN
RAP MUSAGE VAN