I, didn't like the idea of wedges either. Last time I had to deal with the issue , I drilled one side, and the bottom, of the tube and tapped a 3/8" bolt into each, with enough exposed threads for a jam nut. Put the receiver in, tighten the bolts, tighten the jam nuts. Towed for 20k miles using this set up and no problems.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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