“Not good for distance”

“I bought this kayak carrier to take a kayak down to the beach - about a five hour drive, including stretches of interstate. First problem was the stax attachment to the roofrack on a Hyundai Santa Fe. I had to go to a hardware store to get longer bolts. On the drive, the straps kept slipping and kayak slipped. I had to stop several times to adjust kayak and tighten straps. The solution was to purchase bungees to pull the two straps toward the center and maintain tension. Also, despite claims to the contrary, it is definitely better to have lines secured to front and back of vehicle.”