They went on easily, but on my 03 Suburban with aerodynamic bars ...
I bought this set.  In spite of what some have said in past reviews, mine did come with two sets for two kayaks.  They went on easily, but on my 03 Suburban with aerodynamic bars they moved around quite a bit, so I put a little grip tape on them and tightened harder.  Now they work well.  My only caution is to make sure your straps are on the very top of the arch when tightening.  they can get caught on the padding and give a false sense of your kayaks being secured.  No problems though.  Went up to 70 mph for a minute on our first trip and they were totally steady.  Went on bumpy terrain, no problem.  Thx for an inexpensive quality product.
Rating: 4 stars