BarneyS wrote:
In my opinion, you need to fix that back seam, put Eternabond around all roof penetrations and other seams, and then cover the whole roof with Liquid Roof. I did that exact thing several years ago. You can see my posts, with pictures, about it here. This, in my opinion, would be the most effective and cost efficient way for you to fix your older trailer for the limited use you use it. Cost would probably be in the $400 range for all materials.
You did a good job! Looks like you did it while camping - did you?