Very strong bracket attaches to wall or post with three large hex head screws, then two mounting plates are installed in 1.5" or 2" "Hitch boxes bolted on. However, when using the 2" configuration, the end cap of the hex bolt prevents the plate from being inserted. Seems to be an obvious design flaw (unless I'm missing something, which is always possible). I ended up using only two screws, which seems strong enough. Overall it worked for my needs but was an unnecessary frustration.
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