To have massive condensation you have to have a lot of moisture present. It doesn't really matter how well ventilated the trunk is, when the car's stationary it's behaving essentially as a closed vessel. The volume of air in the trunk can only hold so much moisture, so if you're getting massive condensation there must be an external source of water.

MM

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05 Passat TDI Wagon, 155k miles
05 Tacoma, 135k miles
96 F-250 7.3, 225k miles
85 MB 300TD, 275k miles
52 Dodge M37, 4BTA powered
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40 Ford Tudor Sedan (parts everywhere)