^ Tongue in cheek, but something I'd consider...
Honestly bud, I think I'm pretty handy and I can't think of any simple way to go about this.
For a temp repair, IF you could locate the framing in the walls of the overhead and back into the main camper, you could cut a sheet of plywood to fit each side, jack up the overhead and take the sag out of it (looks like it's sagging, no?) and screw a reinforcing "plate" on each side. Upside, I think that would be quite sturdy. Downside, there's some holes in the wall sheathing, but small ones at that.
Bout the only thing I can think of for a field fix.