When setting up my tent I always put a tarp under my tent for condensation. Im not really sure if it works or if it has any use being there. Im also planning a winter trip in WV and not sure how to keep my tent warm from the ground up. Ive heard of digging a foot into the snow where you place your tent, but should I put a tarp underneath or am I causing more problems?? So I guess my main question is What Lies Underneath your tent all four seasons??