The Thule Kayak Support is well made and fits easily and quickly into the slotted roofbar. When loading the kayaks the support feels sturdy. I fixed the kayak down using four straps one each around the supports and then an additional strap through a drain hole at the front and rear of the kayak. There was no movement on an hour long journey to the coast and I feel confident that the product is both fit for purpose and will be robust.