If you have a Travel Supreme, you have a double dome skylight.
The inner skylight is clear and the outer is tinted.
Camping World has skylights.
I had a pair fabricated by
https://www.eztopsworldwide.com/
They were made from Lexan plastic and much heavier than what was up there.
(The OEM outer skylight had been replaced about seven years ago, so I don't know how the lexan skylight compares to the OEM one.)
I'm sure a search of RV skylights on the web would turn up others too.