can't you also drill like 3 1/8 holes on the bottom, and the condensation will go away forever? i read that somewhere on here.
i'm not sure. not familiar with this but it just seems that it would make an exit for the condensation to leave (when the headlights were on and the air inside heated the condensation to a gas)...but it would also provide an entry to mist (and thus condensation in the morning).
it seems to me that condensation would happen overnight, but be gone once the air turned the condensation into gas and the holes would allow it to exit.