Here are some listed where I bought my replacement.
I replaced mine and would do it again because it works great. It runs mostly 24/7. The light wiring would be heavy enough but you would have to make sure of your support. My rv has excellent support structure but still uses a square block of wood on the ceiling to spread the pressures out.
You could easily span a couple of ribs with a nicely built back plate. Some cabinet shop could turn out a piece of art. Be sure no slides will interfere with the blades when closed.
H/R Endeavor 2008
Ford F150 toad >Full Timers
Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008