That was quick.
All their off the shelf skylights are indeed for trailers.
They have sold (1) with a curb in the past; but, and I quote "it did not fit well".
They indicated that they had a pic, although I don't know if it is in the factory, or mounted, or the square skylight that is centered, or the rectangular one that is not. I have asked them to send.
Ours are in such cra, err, crummy condition, I gotta do something; we have a cross country trip coming up, and dealing with roof leaks whilst on the road is not something I look forward to. But screwing and gooping to the deck will not be the solution.
Surely, someone has done this?