TMS - I want to come on your camping trip! We have the plasticky type tent - the worst rain we experienced in it was 50mm in one night. It had rained solidly for the few days we were away and then we got the massive downpour one night. The tent held up well, no leaks or anything. We had mud pushed up on one side, the water was so strong and we were down a slight incline, so it pushed the dirt down onto our tent. But we didn't have any problems. We have a canvas annex and canvas tarps to cover our beds in our pop-up camper van and we've noticed that it does take longer to dry out and the inside roof of the pop-out bed area (think Jayco eagle/dove/hawk/etc) gets wet to touch if we don't have the canvas tarps over them. Saying that though, the camper is 40 years old and we have no certain idea if the canvas is original or not (our feeling is that it probably is original) and we don't know when it was last treated with a waterproofing agent.