I have two questions that you might be able to help me with. (1) is a 3-mil contractor-grade trash bag an appropriate material to use? (2) what shape should the groundcloth be relative to the tent? In my mind, it should match the footprint of the tent MINUS about an inch all around, so that if it's raining the rain won't hit the groundcloth and pool up under the tent. Is this correct? Third question: (3) Does anyone know how to make line-breaks in a forum post here? All of my text is running into itself.