All winter, your trailer sits outside and its roof takes everything: wet leaves, snow that melts by day and refreezes at night, water pooling around the skylights. That freeze and thaw is what cracks the sealant and opens the seams, with nothing to see from the ground. By the time a stain shows up on the ceiling, the water is already in the structure. Our customers told us what it cost them: $3,000 to $11,000 in repairs, and sometimes the whole trailer.