A truck body floor includes a truck body floor frame and a floor plate attached to and supported by the truck body floor frame. The truck body floor frame includes two frame rails extending along a longitudinal length of the truck body floor, and a plurality of bolster structures attached to both of the two frame rails and extending across a width of the truck body floor. The plurality of bolster structures includes at least one layered bolster structure having an inner bolster and an outer bolster that is at least partially flush with and attached to the inner bolster.