Bottom of bed hitch rail to top of hitch head pivot (where the zerk fitting is) is 17.5".
Top of hitch head pivot to truck side rail is about 3.5".
There is some bracing (steel) material that is higher than the hitch head pivot, about the height of the zerk fittings, maybe another .5".
So in my case there is about a safe 3" between the highest part of the hitch and the top of the truck bed side rails.
HTH's
-Steve
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