Joads means in slang: Anyone, whether a group or individual traveling on the highway, who has piled their stuff on top of the carpickuptrailer. These belongings may be covered with a cover or tied with ropes or bungee chords to prevent them from falling out. The family name of Joad was “The Grapes of Wrath”, which describes the character who traveled from California to the dust bowl. (in Slang Dictionary, added by Dante Saunders)
