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Next test will be in the vertical position with a single roof rack on the cab so that I can use my Tonnuau cover but I expect that I'll have to add additional straps to prevent slop in that position.
It handles a 12' kayak and/or a 17' canoe with equal ease. Actually, it can handle as many boats as you can stuff into the back of the truck, stacked high or otherwise. If you have ever declined to go out onto the water because of the difficulty of loading your boat onto your truck, this product is for you.