Let me start by saying that there are no instructions included with this product. However, I contacted the seller and he emailed me within a reasonable time. We recently bought a couple of kayaks. We also bought a cargo trailer to transport them as our SUV doesn't have a roof rack. My husband attached these kayak stands to some of the pieces of wood he had already installed on the trailer. It fits 2 kayaks on the sides, leaving about half a usable trailer for bikes and other gear. While not a common use for this shelving system, it works well and my husband is happy. We had to buy longer carriage bolts as we had to go through wood. I have attached photos.
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