Thanks for the tip FPM III, I will do that.
docmarrin, this has really been pushing the edge of my capabilities but I like to learn, and I'm optimistic to the point of stupidity. We did get a decent deal on the trailer, but not good enough to justify the cost and effort of the roof replacement. Being new to the whole thing I just didn't realize the extent of the water damage when we bought it and didn't expect to need to replace the roof. I figure my cost has been $2,000 - $3,000 for the project so far. If I had to do it over again I wouldn't buy this particular trailer, but I would have a much better eye for water damage!