I put them on my truck and rode them on the road for 12 hours. I've replaced the small straps that come with the stock (tights) with ratchet straps since each can hold 500lbs AND you can actually tighten them. Then I tied down the front and back of the kayak and at each stop (gas, lunch, etc.) just checked the lines. This roofing system worked great, didn't scratch the paint and was easy to remove. I love it and I highly recommend it.
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