This three axle lowbed is rated at 50 tons because it has smaller tires (10.00-15) than the kit number 95046 (11.00-20). Smaller tires reduce the carrying capacity as well as the smaller brakes reducing the safety. This is kit 95047, metal frame so the trailer will not bend or sag over time and styrene parts. The tractor is kit number 95111, an International F-230-D, the heaviest of the line in 1959.