So I took this crossbar off. It bridges the middle between the two cabover "floor" boards.
After looking around I decided to not dismantle the cabover any further.
The crossbar is "T" shaped with the T post sticking up between the two floor boards and then screwed into from the inside. It sandwiches those boards and provides some structure. Even though the leading edge in the picture is on the bottom of the cabover (outside), I still feel like it could be a source of leaks. So I think I will take the bar back off and run a bead of dicor or proflex on the inside corners of the "T". That way when it is pressed back together against the fiberglass it will have a good seal.
I just used eternabond to fix the front side. The second side didn't have a crack, but I put it there for the sake of uniformity and because the sealant on that edge shakes loose during prolonged travel.
I had this short (~4") crack on the rear wall. This is a tiny piece so I'll be able to find a sticker to cover it.
Since I have a lot of eternabond left, I am cleaning up the top leading edge between the cabover the the main RV body. I'll put it there.
