Dump body for a truck

A dump body for a truck comprising:

• a rear left pillar;
• a rear right pillar;
• a tailgate pivotally connected to the rear left and rear right pillars;
• a left upper rail having a rear end connected to an upper portion of the rear left pillar, the left upper rail extending forwardly from the upper portion of the rear left pillar;
• a right upper rail having a rear end connected to an upper portion of the rear right pillar, the right upper rail extending forwardly from the upper portion of the rear right pillar;
• a front wall connected to a front end of the left upper rail and to a front end of the right upper rail;
• a left side wall connected to the front wall, the left upper rail and the rear left pillar, the left side wall extending below the left upper rail;
• a right side wall connected to the front wall, the right upper rail and the rear right pillar, the right side wall extending below the right upper rail;
• a floor connected to the front wall, the rear left pillar, the rear right pillar, a lower end of the left side wall and a lower end of the right side wall;
• a front support assembly connected to an underside of a front portion of the floor;
• and
• a rear support assembly connected to an underside of a rear portion of the floor, a majority of an underside portion of the floor located longitudinally between the front support assembly and the rear support assembly being free of structural support members.