Completely useless to me. This particular block is also advertised (on other sites) for use as a hitch stand. The center hole is too small for the trailer jack. Now agree that you can use it to lock a wheel, but it's expensive for this use and I don't see the point in using both sides. If you have a trailer with two axles, the distance between the two wheels will be larger. To lock a wheel, I recommend the Camco 44414 wheel chock - a 2-pack for about $9 a pair.
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