Abstract: A cargo truck is provided having a loading ramp assembly to aid in loading and unloading items from a cargo box on the truck. The loading ramp assembly is adjustable between a loading position wherein a ramp is provided between a deck of the cargo box and the ground, and a storage position to allow transport of the cargo truck. The loading ramp fits within a pocket between the truck frame and the cargo box when in the storage position. The pocket is formed by long C-shaped box sills that support the cargo box. The ramp is formed by two side rails, a ramp floor between the side rails, and support braces between the ramp floor and the side rails to prevent buckling of the side rails upon application of a load to the ramp. The braces extend below the bottom of the box sills when the ramp is in a storage position. The braces allow for lower profile side rails, thereby reducing the amount the cargo box must be raised above the truck frame to accommodate the ramp assembly.