A suspension and spring shop is the best answer it may be a little more expensive but it is done right, most suspension shops will explain why the super springs are less expensive. I had a bad experience with supersprings, but to each his own , I now have a extra leaf spring on each side and the existing ones were tensioned to match the load I am hauling. making a product that works on several makes and models usually misses something not only specific to your model truck but your individual truck. just my opinion and experience