Fastened this holder and four Maxtrax to a spare tire mounted on the back of a Sprinter, and immediately started a 2,500-mile trip over a variety of roads, mostly paved. However, the unpaved roads were not smooth. This holder did not require tightening, and the Maxtrax stayed put throughout the entire trip resulting in no damage to anything - the van, spare tire, or the Maxtrax.A couple of caveats: 1) Although the holder is sturdy, I would not want to expose it to UV 365 days per year. I plan to mount the holder and Maxtrax when I plan a trip where we plan to off-road or when snow is forecast. 2) There's no provision for locking the holder to the spare. A DIY solution with cables is in my future.The holder is a little spendy, so I'm knocking off one star in the value-for-money category, but on the other hand, the materials and design is robust, so got what I paid for. I will update this review if the holder fails prematurely.