The heavy-duty gas cylinders allow you to add an extra 100 lbs. (50 lbs. per gas cylinder) to the utility trailer. The Standard Gas cylinder has a total capacity of 300 lbs. total. The heavy-duty gas cylinder has a capacity of 400 lbs. total. The heavy-duty gas cylinders help lift your canopy up and down with ease. Heavy Duty Gas-Cylinder dimensions: 24 1/2? x1? and weighs 1lb. Bracket dimensions: 40 1/2? x 2 1/4? and weighs 5lbs. Heavy Duty Gas-Cylinder and bracket are shipped together. Extra lifting capacity when you need it. Perfect for lifting your lid is loaded with bike, kayaks or other gear. Additional information Weight 6 lbs Dimensions 40.5 × 2.25 × 2 in