That's smart, Frank... this one's an older Dometic DuoTherm installed by the original owner. We've plugged it in out in the driveway, and it seems to work alright, both heat & A/C, but it was probably not designed for pop-ups.
Anyway, as I mentioned in a DM to you, depending on how nasty the weather gets with this front coming through from the west, I hope to get to the project later this week. I'll take some close-up shots of the roof cross-section and other stuff as things progress and post them here... barring any unforeseen catastrophe, of course ;)