Check Amazon.com, search 12 VDC Ceiling Fan, I found several there. They also showed remote controls for their fans.
I have a 2015 Fleetwood Excursion with one small window in the bedroom, so no cross ventilation. I was hoping to install a fan just to keep the air moving. My plan (35B) does not have 12 VCD or 120 VAC anywhere near the ceiling so I am stuck looking for other options. If you have 12 VDC nearby,you might consider a Fantastic Fan, they move a lot of air, they have multiple speeds, etc. JH