I installed these on my tandem trailer about a month ago (so I installed 4 of them). I've towed my trailer hundreds of miles with it so far. I towed a trailer on freeways and 4x4 dirt roads. So far they have stayed there. They are easy to lubricate and protect your wheel bearings. Just make sure you put a 2x4 on the hub when pounding it. This protects them from hammer blows and keeps them secure.