Our Yakima Hold Up rear carrier has a thru bolt which was the case for the two previous Yakima hitch carriers we had in the past.

This time, the more expensive version, the Hold Up EVO, has some sort of quicker easier mechanism ("Tool-free locking SpeedKnob makes installation and removal fast, easy and secure") which I can't really speak to except to say it wasn't a thru bolt and have no idea whether it's a good design or not. I didn't buy it, mainly because it was more expensive. It did seem to me at the time, that it might be nice to have a speedier attachment since I do move it on and off the car regularly. But cheapness won and maybe I'm doubly glad I did?

The main reason I buy Yakima is that I have had and have several Yakima products already and like to keep in the same key system.