Are all TC roofs this thin?

1/4 plywood 4" of styrofome in my chalet.
Ducted a/c in roof

And theres your price difference between a wc and af. Ours are definetly not a true 4 season camper

My wife says the whole ceiling bows quite a bit when I'm up there. Granted, I weigh 250. I try to limit my time on the roof, So I send my wife. Lol

Yea, that is about right. Crazy isn't it? And to think I have never heard of anyone falling through the roof doing normal repairs and cleaning, unless it was rotten.

Just to get a little more headroom in my shower, I removed the inner sunlight plexi dome. I can say on my Eagle Cap it is much thicker. Now, I'm not implying mine is great, but...
Mine is a sandwich of 1/4" plywood, then 1 1/2" foam, then another sheet of 1/4" plywood.

That is not thin. Comparing to hand it looks like full 1".
Just weeks ago I repaired cabover floor.
Turns out we have slept on 3 pcs of 3/4 x 1 1/2, about 50% of it rotten.

I was surprised how thin mine was, hence when it rotted replacing it with a top layer of 5mm marine ply and 2mm checker plate on top of that.

Steve.