I appreciate the fact that X shaped wheel locks are aluminum or steel and should be a thousand times stronger - but I didn't want to spend 2 - 3 times more than this unit costs, so we decided to give it a try. Wow! The locking mechanism works very well, locking both wheels and preventing the trailer from rocking. Installation is simple, easy, and the clamping mechanism is all metal. I use it in addition to my wheel chocks and the trailer is stable even with kids jumping all over the place…