I've read lots of articles on this, but I need just a bit more info. I have a 2007 R-vision Trail cruiser 21rbh expandable. While replacing the front bunk seal the other day, I noticed the first 6-8 inches near the hinge is soft, indicating rot inside the door from water leaking. I believe it leaked in on the outside where the fiberglass panel meets the lower aluminum frame and will be re-caulking it this weekend. I also plan to run a strip of Eternabond across that seam since I've got a 4"x50' role coming in the mail to do the roof seams. I'm assuming there is a aluminum frame inside the door that a thin wood substrate is glued/screwed into? I'm hoping its aluminum and not 2x4 because I can probably handle replacing just the surface but if I have to re-make the main supports I'm afraid it won't be as strong. Has anyone done this to an R-vision hybrid and can confirm the internal structure of the bunk door? I was contemplating reinforcing it from the outside (bed surface) with a thin panel of wood to strengthen it up without tearing into it but if the center support is wood and not aluminum, I won't have something of substance to put screws into if its rotted away already. Let me know what you all think, much appreciated. Thanks!