Makes perfect sense. This is why I'm thinking more and more that flexible is better when it comes to the punch factor. Still Roll Cage though for occupant safety.
George, I think what we're all trying to tell you is that it doesn't really make any difference. Any hit that the glass takes is going to hole it. You can, in fact, press on a large panel and watch it flex. If you really want to know how fragile your shell is before you go to the trouble of mounting it on your Mog, take a claw hammer and give it a smack on one of the corners of the trailer. Not really hard, just what you'd expect a 4" tree branch would do at, oh say, crawling speed. Frederick's tear from just a battery
sliding into the glass is pretty good indication of how little it takes to hole the material these are made out of.
Then commence repairs and see if it's something you're willing to do regularly.
I'm an old-time jeep rock crawler and I've creased my fair share of fenders and body parts. I'm reasonably conversant in the kinds of places you're proposing to take yours. I'm really concerned that you think that these glass bodies are more resilient than they are and you're going to go to a bunch of work to do something that may not work.
Frankly, were it me planning your project, I'd be looking at something out of 1/4" plate aluminum panels, or fiberglass vacuum composite walls with aluminum framing... something a little more stout than a fiberglass trailer shell.
Now, if after all that, you still choose to go forward, you may be the first in line to tell me I don't have a clue, and point to your success to prove it!