I have a 98 or 99 westlake with the abs roof on it. This is my 2nd winter storing it. Last year I made a pitched roof with 5 gallon buckets, 2x4's and a tarp. There was plenty of space for air to circulate and the only spot the tarp made contact was along the sides where I bungied it to the frame. My question I'm wondering is this really necessary? My abs roof has a lot of visible hairline cracks and I'm worried about water setting in these cracks and freezing and expanding, essentially opening these cracks up even more. As of right now zero water gets inside the camper and I want to keep it that way. Has anyone had water freeze in these cracks and expand them open?