Skewers are not designed for the kind of sheer loads supporting a rack would impose. If you look at the typical wheel and fork arrangement, you'll see that the axle supports the load, and the skewer only provides the necessary clamping force.
That's not to say that you cannot mount your rack this way. It depends on the loads you plan to carry, and how much support may be had from friction between the rack leg and the dropout.
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Last edited by FBinNY; 12-27-17 at 09:18 AM.