I gave it four stars for the timely arrival of the product. I don't know how well it works. Unfortunately I have no way to adjust the pressure in them. In such a rack there is no way to adjust the pressure at all. This treat is neither on the packaging nor on the manufacturer's website. This can be implied when they mention 87 pounds (I interpreted this as the maximum load that can be placed on the shocks). That's the only way to be warned. If your load is less than 87 pounds, the rack will not collapse. The stand is delivered stretched.