They will loosen, keep an eye on them before each use.
I read the reviews and a few people warned about this.  After the first use, I had to re-tighten everything.  You would think the black knobs behind the nuts would jam together and create a lock tight fit but it doesn't.  They work fine and were easy to install but they flop around if you don't keep them tightened.  Not sure how long I will use these if they get any worse.
Rating: 2 stars