We had to remove the bottom railing because of all the floor board replacements ages ago. (the bottom railing screws into the floor boards.)
Aluminum extrusion ready to be screwed/riveted back in place. We used butyl tape to seal it - hoping to eliminate ANY leak source!!
The bottom edge of the trailer just looks "unfinished" .....
But now the railing is re-installed - and the original rubber "rub-rail" fit back amazingly well.
See how nice it's starting to look???