JudyJB wrote: I would be throwing things and screaming every time something went wrong.
An insulated vent with a fan would be nice, especially if it could give you some more light. That would involve cutting a hole in the roof, however, which would be more than you would want to do.
I used to throw things and scream when things didn't go well (very satisfying!) but after working with computers for 25 years or so I learned not to do that anymore. My lesson: Computers don't care (they really don't!) if things go well or not, or if they work the way they are supposed to. Or not. Getting upset just adds more time to get to the actual fix. Best not to get upset in the first place. Takes less time that way.
I thought about a vent in the roof, and did quite a bit of research on that, and came to the conclusion that no matter how well it was done that, sooner or later (probably sooner for me!) it would leak. And when it
did start to leak, it would leak first
behind the insulation and
behind the paneling and maybe run down
inside the walls (where the leak couldn't be seen initially) before enough water accumulated to actually start to drip from the ceiling.
Possible that it would never drip from the ceiling, and the first thing I would know of it was when water began to run out the bottom of the walls. Which would mean tearing out the whole ceiling and walls, replacing feathering strips, insulation, and paneling (and maybe rusted metal) to do a repair. So decided not to do any cutting in the "skin" of the van in the first place.
Light inside the van seems not to be a problem. I have done all of the interior work with the doors closed and the windows covered with the a/c going. Enough light to work by, so enough light generally, I think.
Thank you for the questions!
Anne