I have the Demco Excalibur rated for 10,500 lbs made out of steel, it is heavy. It is 15 years old and towed about 100,000 miles. I bought the steel one because it was rated higher than the Al one. I removed the shafts to clean them and all the parts are original, just cleaned and lubed every 3 years or so. My tow car only weighs about 2500 lbs so it is over designed for the vehicle and has plenty of safety margin. I will use it until the parts wear out. Every company wants you to by new, Al is lighter and easier to remove but steel is a lot stronger. I choose the heavier weight for a higher safety margin.