I think is a mistake to remount the AC.
Did you consider mounting the AC where it was purposed to go and cutting a new hole for a skylight?
Putting holes in the roof is never a good plan.
I would install a light, LED if power is a concern, and enjoy its luminescent glow.
You will likely install more solar panels down the road, and adding additional junk on the roof will eat up the limited square footage you have for solar panels. Keep the roof clean.
Do you plan to go camping and spend a big part of the daytime sitting in the camper? Most only spend time in the camper at night or during weather events. When you camp you tend to go do things.
I don't thinks these TCs will become collectible like the Airstreams are, but you never know. When I make mods to my fiberglass TC I pride myself on "doing no harm". I removed the fridge and put in drawers and a cabinet and was able to build it 100% so it was un-doable and did not drill any holes or make any alterations to the camper at all. I mounted an electric fridge and also did not do anything that was not 100% un-doable. I know I will probably sell this one day and want the next owner to have a perfect interior and exterior that can easily be returned to stock if thats what they want. This should not be your driving force, but it is just a mentality I like to have on vehicles…
