I have two of these for my double axle travel trailer. I used them the first time in my driveway and they worked great. I used them on my next trip with the same result however after returning home they wouldn't work anymore. While it was sitting in my driveway I put tire shine on the tires after washing my trailer--BIG MISTAKE---now they just shoot out from under the trailer, even after hammering them in a little.
I just got back from my first trip of the season and tried again. After the entire winter, the driveway still will not hold them. I even scratched both sides up to try and provide more friction. No luck. They might work out on my next trip but they don't work in my driveway.