Abstract: A vehicle for supporting cargo in two tiers includes a lower frame for supporting cargo at a lower level and an upper frame for supporting cargo in an elevated position above the lower frame. The vehicle includes a forward support tower and a rear support tower. The forward support tower is pivotally connected to and supports the forward portion of the upper frame. The rear support tower is pivotally connected to and supports the rear portion of the upper frame. The support provided to the rear portion of the upper frame by the rear support tower is longitudinally displaceable, relative to the rear support tower. The lower portion of the rear support tower is pivotally connected to and supported by the rear portion of the lower frame.