good point never thought of that it does not have a trailer as we would just throw it into the back of our truck. Would putting a light under it and turn of the lights then look for light shinning thru work?
Um ... in the dark of night, maybe. The problem you'll have is that leaks don't have to be straight through. Weeping around rivets ... hole under seats, these won't be visible with light. But, spraying water at the inside while someone watches the outside should show wet spots forming where the leaks are.
Took a look at the hull for the first time in a while because it was tarped and there is a bunch of caulk down the center seam. I assume that it will be a seam leak rather than a hole, what would be the best way to reseal the seam?