They are a lot bigger than I thought. I know there are measurements on it but I was impressed with the size when I received it. I used several smaller ledges that were only 3 inches tall. They were mostly suitable for flat surfaces, but I've moved and the driveway to the house where I live is very steep. My boat ended up crashing into the old wedges, hitting the house and fence, and blowing a hole in the wall of my house, destroying the fence. big enough that hopefully the trailer's tires won't jump over it. I even tried to get the boat and trailer to move with them in place and they won't let the boat move. I still think I need a permanent solution like a chain anchored in the ground but they seem to get the job done for a not so permanent solution.
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